Relier Pairs COMMON IDIOMS IN ENGLISHVersion en ligne A short list of common idioms in English. par kepa olaizola garcia 1 Break a leg. 2 Hit the nail on the head. 3 Sleep on it. 4 When pigs fly. 5 Hit the books. 6 Take it easy. 7 Let the cat out of the bag. 8 You can´t judge a book by its cover. 9 Piece of cake. 10 Costs an arm and a leg. Something will never happen. You shouldn´t decide upon something based just on outward appearances. Good luck. To disclose a secret that was supposed to be kept. Something is very easy. Relax To think. Something is very expensive. To study. Something that is precisely right.