Meaning of “dumb” in the English Dictionary

"dumb" in British English

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dumbadjective

uk /dʌm/ us /dʌm/

dumb adjective (SILENT)

C1 permanently or temporarily unable to speak:

He's been deaf and dumb since birth.
She was struck dumb by what she had seen.
dumbness
noun [ U ] uk /ˈdʌm.nəs/ us /ˈdʌm.nəs/

(Definition of “dumb” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"dumb" in American English

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dumbadjective

us /dʌm/

dumb adjective (STUPID)

[ -er/-est only ] infml stupid:

Don’t say anything – just act/play dumb (= pretend to be stupid or not to know something).

dumb adjective (SILENT)

(Definition of “dumb” from the Cambridge Academic Content Dictionary © Cambridge University Press)