From Longman Dictionary of Contemporary Englishcharley horsechar‧ley horse /ˌtʃɑːli ˈhɔːs $ ˌtʃɑːrli ˈhɔːrs/ noun [countable, singular] American English informal MIa pain in a large muscle, for example in your leg, caused by the muscle becoming tight SYN crampOrigin charley horse (1800-1900) Charley male name, from Charles
