Synonyms for Keep mum:

• n.

  •belt up (noun)
  • belt up.
  •be quiet (noun)
  • be quiet.
  •button up (noun)
  • button up.
  •clam up (noun)
  • clam up.
  •close up (noun)
  • close up.
  •dummy up (noun)
  • dummy up.
  •keep mum (noun)
  • shut up.

• Other synonyms:

  •
  • hold out on.
  •
  • classify.
  •
  • conceal.
  •
  • keep back,
  • suppress.
  •
  • hide.
  •
  • guard.
  •Other relevant words:
  • play dumb,
  • keep one's mouth shut,
  • keep silent,
  • keep secret,
  • be silent,
  • hold tongue,
  • hold one's tongue,
  • veil,
  • bosom,
  • remain silent,
  • tongue,
  • keep quiet,
  • secrete,
  • keep from,
  • withhold,
  • bite the tongue,
  • save one's breath,
  • keep dark,
  • say nothing,
  • shut one's mouth,
  • keep to oneself.

Antonyms for Keep mum:

• v.

  • Other antonyms:
    open up.