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