American English

Definition of dumbfound verb from the Oxford Advanced American Dictionary



, NAmE//dʌmˈfaʊnd//
dumbfound somebodyVerb Forms present simple I / you / we / they dumbfound
he / she / it dumbfounds
past simple dumbfounded
-ing form dumbfounding
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to surprise or shock someone so much that they are unable to speak His reply dumbfounded me.
See the Oxford Advanced Learner's Dictionary entry: dumbfound