keep (one's) lips sealed

keep (one's) lips sealed

To not say anything (about something); to keep (something) a secret. Please keep your lips sealed about our engagement, we aren't ready to tell everybody just yet.
See also: keep, lip, seal
Farlex Dictionary of Idioms.
See also:
  • keep (something) under wraps
  • keep (something) by
  • keep by
  • earn its keep
  • keep away
  • keep away (from someone or something)
  • be asking for trouble
  • be looking for trouble
  • keep (one's) eyes on (someone or something)
  • keep (one's) eye(s) out (for something or someone)