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Verb: keep one's mouth shut
  1. Refrain from divulging sensitive information; keep quiet about confidential information
    - keep quiet, shut one's mouth

Derived forms: keeps one's mouth shut, kept one's mouth shut, keeping one's mouth shut

Antonym: talk

Nearest

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
keep one's nose to the grindstone
keep one's shoulder to the wheel
keep open
keep out
keep pace
keep quiet
keep relay
keep step
keep tabs on
keep to oneself