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