Definition of mum adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//mʌm//
; NAmE NAmE//mʌm//
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Word Originadjective late Middle English: imitative of a sound made with closed lips.Idioms (informal) to say nothing about something; to stay quiet He kept mum about what he'd seen.
mum’s the word!
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(informal) used to tell somebody to say nothing about something and keep it secret

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