What does "Break a leg" mean?

Rey, it is considered unlucky to wish someone 'good luck' just before they go on stage as it might jinx the performance. So jokingly wishing them bad luck, as in 'break a leg' is intended to work the superstition backwards and bring them good luck after all. In the UK it is often said before someone undertakes a specific task or 'role', as if they are going on stage themselves.

And here I was thinking that when someone says 'break a leg' it means to hurry up!

Rey, Break a leg referred to the old practice of stomping your foot rather than clapping. If you really liked something and stomped hard enough, you could "break your leg"

It's considered "bad luck" to actually say "good luck" to an actor before they go on stage.

Same saying as give your best