break a leg idiom meaning , origin, examples in a sentence, dark meanings, definition , synonyms, interesting facts, backstory, and the history of the phrase. Break a leg " Break a leg " is an English-language idiom used in the context of theatre or other performing arts to wish a performer "good luck". An ironic or non-literal saying of uncertain origin (a dead metaphor), [1] "break a leg " is commonly said to actors and musicians before they go on stage to perform or before an audition. Definition of break a leg in the Idioms Dictionary. break a leg phrase. What does break a leg expression mean ? Definitions by the largest Idiom Dictionary. Break a leg meaning ! The following lesson provides what does " break a leg " mean , it's origin and how to use this idiom with useful examples and ESL infographic.