Break a leg! Definition 1 of 2Pro Tip 1/3Theatrical Origins Originates from theater superstitions where wishing 'good luck' was considered bad luck. Tonight's your first play, break a leg out there! Pro Tip 2/3Not Literal 'Break a leg' is not taken literally; it's a way to wish success. Your interview is today—break a leg! Pro Tip 3/3Positive Encouragement Used to encourage people when they're about to perform or compete. The competition is tough, but go break a leg!