remain silent
Definitions
To refrain from speaking or making any sound.
To choose not to disclose information or express an opinion.
Examples
The suspect chose to remain silent during the entire police interrogation.
It is often wiser to remain silent when you are angry rather than saying something you might regret.
Synonyms
keep quiet hold one's tongue stay mum keep one's lips sealed refrain from speaking
Antonyms
speak out break one's silence voice an opinion speak up start talking