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To wish someone good luck, especially before a performance.
The director told the cast to break a leg before the opening night.
He was wishing them good luck.
Often used in theater; saying it literally would be considered bad luck.
Say it to performers, speakers, or anyone about to undertake a challenging task; avoid using it in literal contexts.
Originates from early 20th‑century theater superstition that wishing "good luck" directly would tempt fate, so a reverse wish was used. Some theories link it to the German phrase "Hals- und Beinbruch" (neck and leg fracture) or to the idea of breaking a leg line on stage.
Do not use literally; it is a figurative expression. Appropriate before performances, exams, or any situation where encouragement is needed.