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charley horse (n.)
1887, sporting slang, origin obscure, probably from somebody's long-forgotten lame racehorse. Charley horse seems to have been a name for a horse or a type of horse (perhaps especially a lame one) around that time.
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Definitions of charley horse from WordNet
Dictionary entries near charley horse
charlatanism
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Charles
Charles's Wain
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charley horse
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charm
charmer
charming