English dictionary keep mum meaning and definition Definition and meaning of keep mum at MeaningMonkey.org. keep mum meaning and definition in the English Dictionary. KEEP MUM verbDefinition of keep mum (verb)refuse to talk or stop talking; fall silent"The children shut up when their father approached"synonyms: be quiet, belt up, button up, clam up, close up, dummy up, shut upantonym: open up Source: Princeton University Wordnet
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