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Verb: keep mum  keep múm
  1. Refuse to talk or stop talking; fall silent
    - close up, clam up, dummy up [N. Amer], shut up, belt up, button up, be quiet

Derived forms: kept mum, keeping mum, keeps mum

Nearest

keep apart
keep away
keep back
keep company
keep down
keep fit
keep going
keep guard
keep in
keep in line
keep mum
keep note
keep off
keep on
keep one's distance
keep one's eyes off
keep one's eyes open
keep one's eyes peeled
keep one's eyes skinned
keep one's hands off
keep one's mouth shut