Idioms dictionary - List of idioms and phrases for kids
 A bitter pill  A situation or information that is unpleasant but must be accepted.
 A dime a dozen  Anything that is common, inexpensive, and easy to get or available any where.
 Ace in the hole  A hidden or secret strength, or unrevealed advantage.
 Achilles' heel  A metaphor for a fatal weakness in spite of overall strength.
 Acid test  crucial test
 Add insult to injury  To further a loss with mockery or indignity; to worsen an unfavorable situation.
 Albatross around his neck  a burden to be carried as a result of a sin committed
 all and sundry  every one
 All ears  Listening intently; fully focused or awaiting an explanation.
 All thumbs  Clumsy, awkward.
 At the drop of a hat  Without any hesitation; instantly.
 Barking up the wrong tree  Looking in the wrong place.
 Basket case  One made powerless or ineffective, as by nerves, panic, or stress.
 Beat around the bush  To treat a topic, but omit its main points, often intentionally or to delay or avoid talking about something difficult or unpleasant.
 Bite off more than one can chew  To take on more responsibility than one can manage.
 Bite the bullet  To endure a painful or unpleasant situation that is unavoidable.
 Bite the dust  Euphemism for dying or death.
 Break a leg  A saying from the theatre that means "good luck".
 Burn the midnight oil  To work late into the night, alluding to the time before electric lighting.
 Bust one's chops  To say things intended to harass.
 By the seat of one's pants  To achieve through instinct or do something without advance preparation.
 By the skin of one's teeth  Narrowly; barely. Usually used in regard to a narrow escape from a disaster.
 Call it a day  To declare the end of a task.
 Chew the fat  To chat idly or generally waste time talking.
 Chink in one's armor  An area of vulnerability
 Clam up  To become silent; to stop talking, to shut up.
 Cold shoulder  To display aloofness and disdain.
 Couch potato  A lazy person.
 Cut a rug  To dance
 Cut the cheese  To pass gas, fart, break wind
 Cut the mustard  To succeed; to come up to expectations.
 Don't have a cow  Don't overreact.
 Drop a dime  Make a telephone call; to be an informant.
 Fit as a fiddle  In good physical health.
 For a song  Almost free. Very cheap.
 From A to Z  Covering a complete range; comprehensively.
 From scratch / to make from scratch  Make from original ingredients; start from the beginning with no prior preparation
 Get bent out of shape  To take offense; to get worked up, aggravated, or annoyed
 Have a blast  To have a good time or to enjoy oneself.
 Have eyes in the back of one's head  Someone can perceive things and events that are outside of their field of vision.
 Hit the road  To leave.
 Hit the sack /sheets/hay  To go to bed.
 Kick the bucket  Euphemism for dying or death.
 Let the cat out of the bag  To reveal a secret.
 Off one's trolley or  
 Off one's rocker  Crazy, demented, out of one's mind, in a confused or befuddled state of mind, senile.
 Off the hook  To escape a situation of responsibility, obligation, or (less frequently) danger.
 Piece of cake  A job, task or other activity that is pleasant – or, by extension, easy or simple.
 Pop one's clogs (UK)  Euphemism for dying or death.
 Pull somebody's leg  To tease or to joke by telling a lie.
 Pushing up daisies  Euphemism for dying or death.
 Put the cat among the pigeons  To create a disturbance and cause trouble.
 Right as rain  Needed, appropriate, essential, or hoped-for and has come to mean perfect, well, absolutely right.
 Screw the pooch  To screw up; to fail in dramatic and ignominious fashion.
 Shoot the breeze  To chat idly or generally waste time talking.
 Sleep with the fishes  Euphemism for dying or death.
 Spill the beans  Reveal someone's secret.
 Split the whistle  To arrive just on time.
 Take the biscuit (UK)  To be particularly bad, objectionable, or egregious.
 Take the cake (US)  To be especially good or outstanding.
 Through thick and thin  In both good and bad times.
 Thumb one's nose  To express scorn or to disregard.
 Trip the light fantastic  To dance
 Under the weather  Feel sick or poorly
 You can say that again  That is very true; expression of wholehearted agreement
 Cat nap  Short sleep.