charley horse

a painful, involuntary cramp of an arm or leg muscle resulting from excessive muscular strain or a blow.

1885–90; orig. baseball slang Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
charley horse (ˈtʃɑːlɪ)
informal (US), (Canadian) muscle stiffness or cramp following strenuous athletic exercise
[C19: of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

charley horse
baseball players' slang, 1888, origin obscure, probably from somebody's long-forgotten lame racehorse.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

charley horse char·ley horse (chär'lē hôrs')
Localized pain or stiffness in a muscle following excessive muscular exertion or the contusion of a muscle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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