What does the expression "break a leg" mean?

Hi there

Thank you for your question.

The phrase “break a leg” is used to wish someone good luck, usually someone who is in performing arts or theatre. It is believed to originate from the superstition that wishing someone good luck directly would bring back luck, so saying the opposite, in this case, ‘break a leg’, was a way to reverse the so-called jinx or superstition of bad luck.

I hope this answers your question, and I look forward to answering any further questions you may have.