Definition of dunno from the Oxford Advanced Learner's Dictionary



BrE BrE//dəˈnəʊ//
; NAmE NAmE//dəˈnoʊ//
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a way of writing the informal spoken form of ‘I don’t know’ More Like This Contractions in non-standard language ‘nother, ain’t, doncha, dunno, ‘em, gonna, gotcha, gotta, innit, wanna, ya, yerSee worksheet.
See the Oxford Advanced American Dictionary entry: dunno