Definition of southpaw noun from the Oxford Advanced Learner's Dictionary

 

southpaw

 noun
noun
BrE BrE//ˈsaʊθpɔː//
 
; NAmE NAmE//ˈsaʊθpɔː//
 
(informal, especially North American English) Combat sports
 
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a person who prefers to use their left hand rather than their right, especially in a sport such as boxing See related entries: Combat sports Word Origin mid 19th cent. (denoting the left hand or a punch with the left hand).
See the Oxford Advanced American Dictionary entry: southpaw