break a leg
- 1A cheerful way to wish someone good luck before they perform or try something hard.
Like saying "You've got this!" to a friend right before a big moment.
Break a leg in your school play tonight!
Her friends all said break a leg before the big audition.
Note
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Origin
Nobody knows for sure where this saying comes from. One idea is that it came from a Yiddish phrase meaning "success and blessing" through Jewish influence in American theater.