This
database is a comprehensive collection of all the American idioms and slang available.
American Idioms are many and varied. We hope you enjoy our collection. We are adding more all the time.
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Break a leg in your game today. "Break a leg" is sourced in superstition. It is a wish of good luck, but the words wish just the opposite. It was once common for people to believe in Sprites. Sprites are actually spirits or ghosts that were believed to enjoy wreaking havoc and causing trouble. If the Sprites heard you ask for something, they were reputed to try to make the opposite happen. Telling someone to "break a leg" is an attempt to outsmart the Sprites and in fact make something good happen. Sort of a medieval reverse psychology.
break a leg What does break a leg mean?
good luck; hope all goes well (from theatrical slang, where "good luck" is a jinx)