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



BrE BrE//ˈdʌmbəʊ//
; NAmE NAmE//ˈdʌmboʊ//
(pl. dumboes)(informal)
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a stupid person Don’t call me a dumbo! Word Origin 1950s (originally US): from dumb + -o, popularized by the 1941 cartoon film Dumbo.
See the Oxford Advanced American Dictionary entry: dumbo