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

 

sweatsuit

 noun
noun
BrE BrE//ˈswetsuːt//
 
, also BrE//ˈswetsjuːt//
 
; NAmE NAmE//ˈswetsuːt//
 
(informal sweats [plural])(both North American English)
 
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a sweatshirt and sweatpants worn together, for relaxing or playing sports in
See the Oxford Advanced American Dictionary entry: sweatsuit