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