Why do people say "break a leg" instead of "good luck"?

Good luck. Specifically, it's the phrase used before a performance, instead of "good luck," which is considered bad luck in theatre superstition. When someone says "break a leg," they are genuinely wishing you well and hoping you succeed. They are not, of course, hoping you injure yourself. It's a warm and slightly playful way to send someone off before a big moment.

Theatre tradition holds that saying "good luck" before a performance invites bad luck. "Break a leg" became the alternative. You wish someone the opposite of what you mean, and the universe supposedly reverses it. There are also theories about "breaking" the "leg line," which is the side of the stage, when you take a bow after a successful show. Under this idea, breaking the leg line would mean you performed well enough to be called back for applause. Another old theory connects it to bending, or "breaking," the knee in a deep bow. Nobody knows the true origin for certain, but every version links the phrase to a strong performance, not to real harm.

Originally theatre only, but now commonly used before any performance, presentation, exam, interview, or important event. A friend before an audition, a classmate before a speech, or a colleague before a big pitch would all appreciate it.

• "Good luck!" - standard and always appropriate
• "Break a leg!" - specifically before performances or high-stakes moments, adds personality
• "All the best!" - formal and warm, works for written messages
• "Knock 'em dead!" - informal, energetic, implies a big performance
• "You've got this" - more about confidence than luck

• "Break a leg tonight, you've rehearsed so hard for this."
• "Big interview tomorrow? Break a leg, I know you'll do great."
• "She whispered 'break a leg' as I walked on stage."
• "You're presenting to the whole department later, right? Break a leg!"

Learners sometimes reply to "break a leg" with a confused or worried face, thinking it's a threat or an insult. It is neither. The correct response is a simple "Thanks!" or "Cheers!" Another mistake is using it in a formal email or a serious business document, where it can feel too casual. Save it for spoken moments or friendly messages.

Picture an actor bowing so deeply after a wonderful show that they almost "break" at the knee. The image ties the phrase to success and applause, not injury, which makes it easier to remember what it really means.

The phrase is understood and used in both British and American English, and it means the same thing on both sides of the Atlantic. Americans might lean toward the punchy "knock 'em dead," while British speakers may also say "best of luck" in the same situations. Neither group would say "break a leg" in a truly formal setting, so the register stays casual everywhere.

Casual and warm. Works well spoken before a performance or high-stakes event. Slightly odd in formal written communication. In a workplace, it feels natural said out loud to a colleague before their presentation, but you would choose "all the best" or "wishing you every success" in a written company message. In casual settings among friends, "break a leg" fits perfectly and shows you care.

"Fingers crossed" is another lucky phrase, often paired with hope for a good outcome, as in "Fingers crossed you get the job." Unlike "break a leg," which you say to encourage the person doing something, "fingers crossed" is often about your own hope for the result. You can even use them together: "Break a leg today, fingers crossed it all goes smoothly."