Final answer:
The idiom 'break a leg' is used to wish someone good luck, particularly in the performing arts. It is a superstitious way of avoiding bad luck in theater.
Step-by-step explanation:
The idiom 'break a leg' is a phrase commonly used in the performing arts, especially in theater. It is used to wish someone good luck before a performance or an audition. While it may seem strange to wish someone to break their leg, it is believed to be a superstitious way of avoiding bad luck. In theater, wishing someone good luck is considered to be bad luck, so the phrase 'break a leg' is used instead.
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