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

 

gusset

 noun
noun
BrE BrE//ˈɡʌsɪt//
 
; NAmE NAmE//ˈɡʌsɪt//
 
 
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an extra piece of cloth sewn into a piece of clothing to make it wider, stronger or more comfortable Word Origin late Middle English: from Old French gousset, diminutive of gousse ‘pod, shell’, of unknown origin.
See the Oxford Advanced American Dictionary entry: gusset