Definition of yessir exclamation from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈjesə(r)//
; NAmE NAmE//ˈjesər//
; BrE BrE//ˈjessɜː(r)//
; NAmE NAmE//ˈjessɜːr//
(informal, especially North American English)
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used to emphasize your opinion or say that you agree very strongly Yessir, she was beautiful. Word Originearly 20th cent.: alteration of yes sir.
See the Oxford Advanced American Dictionary entry: yessir