keep quiet

phrase

1

: to not say anything or make any noise

He thought about telling the police what he knew, but he decided to keep quiet.

Please keep quiet during the movie.

2

: to not say anything about (something)

She kept her plans quiet.

3

: to prevent (someone or something) from making noise

She gave the dog a bone to keep him quiet.

4

: to prevent (someone) from revealing information about something

They paid money to the witness to keep him quiet.