Definition of keep quiet
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.
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