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keep quiet (about someone or something)and keep still (about someone or something)
to refrain from talking about someone or something; to keep a secret about someone or something. Please keep quiet about the missing money. Please keep still about it. All right. I'll keep still.
keep something quietand keep something still
Fig. to keep something a secret. I'm quitting my job, but my boss doesn't know yet. Please keep it quiet. Okay. I'll keep it still
keep quiet (about something)
to not talk about something You know you can trust me to keep quiet. The governor has kept quiet about raising taxes.
Also, keep still.
1. Also, be quiet or still . Remain silent; same as hold one's tongue. For example, Please keep quiet about the party. Also see keep one's mouth shut.
2. Refrain from moving, stay in the same position; same as hold still. For example, The doctor gave the young boy a toy to keep him quiet while on the examining table, or It's hard for the baby to keep still unless he's sleeping. [Late 1300s]