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Noun: charley horse  'chaar-lee,hors
Usage: US
  1. A muscular cramp (especially in the thigh or calf) following vigorous exercise
    "He got a charley horse in his calf during the soccer match";
    - charley-horse [US, informal]

Derived forms: charley horses, charley-horses

Type of: cramp, muscle spasm, spasm

Encyclopedia: Charley horse