Why do you say 'break a leg' instead of 'good luck'?

What it means: Good luck. Specifically, it's the phrase used before a performance - instead of "good luck," which is considered bad luck in theatre superstition.

Where it comes from: 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" (the side of the stage) when you take a bow after a successful show, which would mean you performed well.

Where you use it: Originally theatre only, but now commonly used before any performance, presentation, exam, interview, or important event.

• "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

Register: Casual and warm. Works well spoken before a performance or high-stakes event. Slightly odd in formal written communication.

Tags: idiom, theatre, good luck, superstition, everyday English