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