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 You can´t judge a book by its cover. 3 When pigs fly. 4 Let the cat out of the bag. 5 Break a leg. 6 Hit the books. 7 Piece of cake. 8 Sleep on it. 9 Take it easy. 10 Costs an arm and a leg. Something that is precisely right. You shouldn´t decide upon something based just on outward appearances. Something will never happen. Good luck. To study. To disclose a secret that was supposed to be kept. Something is very easy. Relax Something is very expensive. To think.