Definition of cocksure adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌkɒkˈʃʊə(r)//
, BrE//ˌkɒkˈʃɔː(r)//
; NAmE NAmE//ˌkɑːkˈʃʊr//
(old-fashioned, informal)
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confident in a way that is annoying to other people and that they might find offensive Word Originearly 16th cent.: from archaic cock (a euphemism for God) + sure; later associated with cock.
See the Oxford Advanced American Dictionary entry: cocksure