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 Sleep on it. 3 Break a leg. 4 Hit the books. 5 Hit the nail on the head. 6 Let the cat out of the bag. 7 Costs an arm and a leg. 8 Take it easy. 9 Piece of cake. 10 When pigs fly. Good luck. Something that is precisely right. To study. Something is very easy. To think. Relax Something is very expensive. 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.