Idioms are wonderful phrases where the words together create a brand new meaning instead of what they say separately. People use these clever expressions to make their conversations lively and describe secrets, concealment, and keeping things quiet in colorful ways. In this guide, you will discover fifty interesting idioms related to hiding something.
In this lesson, we’ll look at idioms that mean keeping secrets and concealing facts. Let’s get started and explore some of these helpful expressions.
Idioms for Hiding Something
1. Ace up your sleeve
Definition: A secret plan, trick, or item that you keep hidden until you need to use it.
Used in a Sentence: During the card game, my brother revealed an ace up his sleeve to win. / I kept my best math trick as an ace up my sleeve for the final test.
Similar Expressions: Secret plan / Hidden advantage
2. Bag of tricks
Definition: A collection of secret methods or strategies used to handle a problem.
Used in a Sentence: The magician pulled a rabbit from his bag of tricks during the show. / Our coach has a whole bag of tricks to help us win close soccer matches.
Similar Expressions: Secret methods / Hidden strategies
3. Behind closed doors
Definition: Happening in private, out of sight from the public or other people.
Used in a Sentence: The club members made their voting choices secretly behind closed doors. / We talked about the surprise party plan behind closed doors so nobody would hear.
Similar Expressions: In private / Secretly done
4. Bury your head in the sand
Definition: To pretend a problem does not exist by ignoring it or hiding from it.
Used in a Sentence: Do not bury your head in the sand when it is time to study for exams. / He tried to bury his head in the sand instead of admitting he broke the vase.
Similar Expressions: Ignore reality / Avoid the truth
5. Bury the hatchet
Definition: To stop hiding old anger and make peace after a secret disagreement.
Used in a Sentence: After arguing about the toy, the brothers decided to bury the hatchet and share. / It is always better to bury the hatchet than hold onto a grudge.
Similar Expressions: Make peace / End the fight
6. Card up your sleeve
Definition: Holding onto a secret advantage or plan without telling anyone else.
Used in a Sentence: She played quietly because she had another card up her sleeve for the spelling bee. / Do you have another card up your sleeve to solve this riddle?
Similar Expressions: Hidden plan / Secret asset
7. Carpet bagger
Definition: Someone who hides their true intentions while moving into a new place for personal gain.
Used in a Sentence: The old story warned villagers about strangers acting like a carpet bagger. / People sometimes distrust someone who enters a group like a carpet bagger.
Similar Expressions: Secret opportunist / Hidden outsider
8. Catch someone red-handed
Definition: To discover someone in the very act of hiding or doing something wrong.
Used in a Sentence: My mom caught me red-handed trying to sneak a cookie before dinner. / The teacher caught him red-handed hiding the answer key in his desk.
Similar Expressions: Caught in the act / Discovered instantly
9. Cloak and dagger
Definition: Involving secret plots, mystery, and hidden activities.
Used in a Sentence: Planning the surprise birthday party felt like a cloak and dagger operation. / My little sister loves reading cloak and dagger mystery stories about spies.
Similar Expressions: Highly secret / Mysterious plot
10. Close to the chest
Definition: Keeping your plans, thoughts, or secrets tightly guarded from others.
Used in a Sentence: He played his cards close to the chest so nobody knew his strategy. / She kept her surprise project close to the chest until the art show.
Similar Expressions: Guarded tightly / Secretive approach
11. Cover your tracks
Definition: To hide evidence or erase clues so nobody discovers what you did.
Used in a Sentence: After eating the last slice of cake, he quickly tried to cover his tracks. / The sneaky puppy tried to cover its tracks by hiding the chewed shoe under the bed.
Similar Expressions: Hide evidence / Erase clues
12. Dark horse
Definition: A person who keeps their skills and abilities hidden until they surprise everyone.
Used in a Sentence: Nobody knew he could paint so well because he was a dark horse in art class. / The quiet student turned out to be a dark horse in the chess tournament.
Similar Expressions: Quiet achiever / Hidden talent
13. Deep dark secret
Definition: A matter that is kept hidden away from everyone with great care.
Used in a Sentence: Where we hid the birthday presents was a deep dark secret between us. / He promised never to share my deep dark secret with the rest of the class.
Similar Expressions: Strictly guarded secret / Hidden truth
14. Dust under the rug
Definition: Hiding small problems or messes instead of cleaning them up properly.
Used in a Sentence: Do not just sweep the dirt under the rug when you clean your room. / The manager tried to put the minor mistake under the rug, but we noticed.
Similar Expressions: Sweep away / Hide flaws
15. Face like a mask
Definition: Keeping your expression completely blank to hide your true feelings.
Used in a Sentence: He kept a face like a mask so nobody could guess his card hand. / She wore a face like a mask to hide her nervousness during the speech.
Similar Expressions: Blank expression / Hidden emotions
16. Get wind of
Definition: To secretly find out about a hidden plan or surprise before it happens.
Used in a Sentence: We hoped nobody would get wind of our surprise party plans. / The dog managed to get wind of the hidden treats in the pantry.
Similar Expressions: Find out secretly / Discover the plot
17. Ghost writer
Definition: Someone who writes a book or article while keeping their identity hidden.
Used in a Sentence: The famous celebrity hired a ghost writer to tell her life story. / Many adventure novels are actually written by an anonymous ghost writer.
Similar Expressions: Secret author / Hidden creator
18. Keep a lid on it
Definition: To keep information or feelings hidden and prevent them from spreading.
Used in a Sentence: Please keep a lid on the surprise party until Saturday afternoon. / We tried to keep a lid on our laughter during the quiet test.
Similar Expressions: Keep quiet / Maintain silence
19. Keep mum
Definition: To remain completely silent and refuse to reveal a secret.
Used in a Sentence: Promise to keep mum about where we hid the treasure map. / The witness decided to keep mum to protect her friend’s identity.
Similar Expressions: Stay silent / Say nothing
20. Keep under wraps
Definition: To keep a project, gift, or plan hidden from public view.
Used in a Sentence: We kept our science fair invention under wraps until judging day. / The movie studio kept the ending under wraps to prevent spoilers.
Similar Expressions: Kept secret / Hidden away
21. Keep your cards close to your chest
Definition: To hide your intentions or strategies from other people.
Used in a Sentence: In board games, you should always keep your cards close to your chest. / She kept her career plans close to her chest until everything was official.
Similar Expressions: Guard plans / Be secretive
22. Lead down the garden path
Definition: To trick or deceive someone by hiding the real truth from them.
Used in a Sentence: The tricky riddle tried to lead us down the garden path with false clues. / Do not let dishonest friends lead you down the garden path.
Similar Expressions: Trick someone / Mislead cleverly
23. Leak like a sieve
Definition: To be very bad at keeping secrets because information slips out easily.
Used in a Sentence: Do not tell him the surprise because his mind leaks like a sieve. / Her group project plans leaked like a sieve to the rival team.
Similar Expressions: Poor secret keeper / Spill details
24. Let the cat out of the bag
Definition: To accidentally reveal a secret that was supposed to stay hidden.
Used in a Sentence: My little brother let the cat out of the bag about the Disneyland trip. / Try not to let the cat out of the bag before the birthday cake arrives.
Similar Expressions: Reveal the secret / Spill the beans
25. Look the other way
Definition: To deliberately ignore bad behavior or pretend you did not see something hidden.
Used in a Sentence: The guard chose to look the other way when the puppy snuck into the park. / You cannot just look the other way when someone breaks the rules.
Similar Expressions: Ignore wrongdoing / Pretend not to notice
26. Mask your feelings
Definition: To hide your true emotions behind a fake smile or calm exterior.
Used in a Sentence: He tried to mask his feelings of disappointment when he lost the race. / She could not entirely mask her feelings of excitement about the puppy.
Similar Expressions: Hide emotions / Conceal feelings
27. Mum is the word
Definition: A phrase reminding someone to stay quiet and keep a secret hidden.
Used in a Sentence: We agreed that mum is the word regarding the classroom prank. / Remember that mum is the word until the principal makes the announcement.
Similar Expressions: Keep quiet / Silence guaranteed
28. Off the record
Definition: Information shared informally that is meant to be kept hidden from publication.
Used in a Sentence: The principal spoke to the newspaper reporter off the record about the new schedule. / Please treat this information as off the record for now.
Similar Expressions: Informally shared / Not for publication
29. On the down low
Definition: Doing something quietly and secretly without drawing attention.
Used in a Sentence: We planned the surprise gift on the down low so nobody would guess. / He practiced his magic trick on the down low before showing the family.
Similar Expressions: Quietly done / Secretively kept
30. Out of sight, out of mind
Definition: Forgetting about something or someone because it is hidden from view.
Used in a Sentence: I hid the candy jar in the pantry because out of sight, out of mind. / Putting my old toys in the closet proved that out of sight, out of mind works.
Similar Expressions: Easily forgotten / Hidden away
31. Paint a false picture
Definition: To misrepresent the truth by hiding important facts from people.
Used in a Sentence: Leaving out those details paints a false picture of our project results. / Do not paint a false picture of how much homework we actually have.
Similar Expressions: Mislead others / Hide facts
32. Play your cards close to your chest
Definition: To hide your plans and strategies from competitors.
Used in a Sentence: The chess champion always plays his cards close to his chest. / She played her strategy close to his chest during the debate club.
Similar Expressions: Guard your moves / Keep secrets
33. Pull the wool over someone’s eyes
Definition: To trick or deceive someone by hiding the truth from them.
Used in a Sentence: You cannot pull the wool over the teacher’s eyes regarding copied homework. / He tried to pull the wool over our eyes about who ate the cookies.
Similar Expressions: Fool someone / Trick deceitfully
34. Put in a dark corner
Definition: To hide something away where nobody will ever find it.
Used in a Sentence: We put the broken chair in a dark corner of the basement. / Do not push your responsibilities into a dark corner to ignore them.
Similar Expressions: Hide away / Stash out of sight
35. Pull a fast one
Definition: To trick someone through sneaky actions or hidden dishonesty.
Used in a Sentence: He tried to pull a fast one by trading a fake baseball card. / Watch out for his tricks because he loves to pull a fast one.
Similar Expressions: Trick sneakily / Deceive quickly
36. Ride under false colors
Definition: To hide your true identity or intentions while interacting with others.
Used in a Sentence: The sneaky vendor was riding under false colors at the craft fair. / Do not trust anyone who comes to our club riding under false colors.
Similar Expressions: Hide identity / Fake intentions
37. Safe in a vault
Definition: Kept securely hidden away where nobody can steal or discover it.
Used in a Sentence: Our family recipe is kept safe in a vault at the bank. / The secret treasure map was hidden safe in a vault behind the painting.
Similar Expressions: Securely locked / Strictly hidden
38. Secret squirrel
Definition: Someone who acts overly mysterious about ordinary, hidden things.
Used in a Sentence: Why are you acting like such a secret squirrel about your sandwich ingredients? / My sister is a total secret squirrel when it comes to her diary.
Similar Expressions: Overly mysterious / Sneaky person
39. See through someone
Definition: To recognize someone’s hidden motives or dishonesty instantly.
Used in a Sentence: The teacher could see through his excuse for not doing homework. / I saw through her fake smile and knew she was hiding bad news.
Similar Expressions: Spot dishonesty / Unmask trick
40. Shadowy figure
Definition: A person whose identity and actions remain hidden in the dark.
Used in a Sentence: We spotted a shadowy figure moving near the school gate at midnight. / The mystery novel featured a shadowy figure hiding clues in the library.
Similar Expressions: Mysterious person / Hidden stranger
41. Skeleton in the closet
Definition: A shameful secret from the past that someone tries hard to keep hidden.
Used in a Sentence: Every family has some funny little skeleton in the closet from childhood. / He guarded his old spelling test failure like a skeleton in the closet.
Similar Expressions: Past secret / Hidden embarrassment
42. Smoke and mirrors
Definition: Clever tricks used to hide the truth and confuse people.
Used in a Sentence: The complicated explanation was just smoke and mirrors to hide his mistake. / Do not fall for his smoke and mirrors routine during the debate.
Similar Expressions: Illusion / Deceptive trick
43. Sneak around
Definition: To move quietly and secretly to avoid being seen by others.
Used in a Sentence: The puppy tried to sneak around the living room with my sock. / Stop trying to sneak around the kitchen before dinner is served.
Similar Expressions: Move secretly / Prowl quietly
44. Spill the beans
Definition: To reveal a secret that was supposed to stay hidden.
Used in a Sentence: Who decided to spill the beans about our surprise party? / He promised not to spill the beans, but he told everyone anyway.
Similar Expressions: Reveal the truth / Let slip
45. Stash away
Definition: To hide money, items, or food safely in a secret place.
Used in a Sentence: She liked to stash away candy wrappers inside her desk drawer. / We managed to stash away extra supplies in the clubhouse attic.
Similar Expressions: Hide away / Store secretly
46. Sweep under the rug
Definition: To hide a problem or mistake instead of dealing with it openly.
Used in a Sentence: You cannot just sweep your bad grades under the rug and ignore them. / The committee tried to sweep the budget error under the rug.
Similar Expressions: Ignore problems / Hide mistakes
47. Talk behind someone’s back
Definition: To say negative or secret things about someone when they are not listening.
Used in a Sentence: It hurts when classmates talk behind your back instead of being honest. / Always avoid talking behind your friends’ backs.
Similar Expressions: Gossip secretly / Speak covertly
48. Under the radar
Definition: Doing something quietly so it remains unnoticed by authorities or others.
Used in a Sentence: We completed our art project completely under the radar. / The sneaky cat walked under the radar to steal food from the table.
Similar Expressions: Unnoticed / Quietly done
49. Veil of secrecy
Definition: A heavy cover of mystery that keeps information hidden from the public.
Used in a Sentence: The new video game project was developed under a thick veil of secrecy. / They operated behind a veil of secrecy until the official launch.
Similar Expressions: Blanket of mystery / Hidden cover
50. Wear a mask
Definition: To hide your true personality or feelings behind a false appearance.
Used in a Sentence: Sometimes people wear a mask at school to hide how nervous they feel. / You do not need to wear a mask around your true friends.
Similar Expressions: Hide true self / Conceal identity
Exercise to Practice
- Having an ace up your sleeve means you have a secret plan or trick kept hidden until needed.
- Burying your head in the sand means you are playing in a sandbox at the playground.
- Catching someone red-handed means you discover someone in the act of hiding something wrong.
- Keeping your cards close to your chest means you are holding heavy sports cards in your hands.
- Leaking like a sieve means you are holding water tightly inside a metal bucket.
- Letting the cat out of the bag means you accidentally reveal a secret that was hidden.
- Sweeping a problem under the rug means you are cleaning your bedroom floor with a broom.
- Spilling the beans means you are cooking dinner by dropping groceries on the kitchen floor.
- Acting like a secret squirrel means you are climbing oak trees gathering acorns in autumn.
- Having a skeleton in the closet means you own a plastic science model of human bones.
- Operating under the radar means you are flying a high-tech airplane through stormy clouds.
- Keeping information under wraps means you are wrapping a birthday present in colorful paper.
- Stashing away supplies means you are hiding items safely in a secret place.
- Wearing a mask means you are dressing up as a superhero for a costume party.
- Talking behind someone’s back means you are giving your friend a gentle piggyback ride.
Answer Key
- True
- False
- True
- False
- False
- True
- False
- False
- False
- False
- False
- False
- True
- False
- False
Conclusion
Learning these idioms helps you describe secrets, concealment, and keeping things quiet in creative ways. These expressions add wonderful imagery to your daily conversations and help you talk about hidden things clearly.
Try using a few of these phrases the next time you plan a surprise or read a mystery story. You will connect better with friends and share your experiences with wonderful words.
Frequently Asked Questions
What are some common idioms for hiding something?
Some popular expressions include spilling the beans, letting the cat out of the bag, and keeping something under wraps. These phrases help describe how people handle secrets and concealed facts.
Why do we use idioms in English?
Idioms let us express complex secrecy and hidden actions in colorful, memorable ways rather than plain language. They make storytelling and everyday conversation much more expressive.
How can I remember these idioms easily?
You can remember them best by connecting each phrase to a relatable moment like planning a surprise party or reading a mystery book. Using them in your daily writing and speaking practice will also help them stick in your memory.
Are idioms used in formal secret service reports?
Idioms are usually best for casual conversations, personal stories, and creative writing rather than strict official documents. Using them in everyday chat makes your speaking sound natural and warm.
Do all English idioms have literal meanings?
No, idioms have figurative meanings where the phrase as a whole means something completely different from the individual words. Learning the specific definitions helps you use them correctly in conversation.
