keep quiet

/K IY1 P K W AY0 AH0 T/
verb
  1. 1

    To remain silent.

    โ€œGranny is asleep, so keep quiet while you play.โ€

  2. 2

    To refrain from talking about something; to keep a secret.

    โ€œRemember it's a surprise party, so keep quiet about it.โ€

Source: https://en.wiktionary.org/wiki/keep%20quiet