keep one's mouth shut|keep|mouth|shut イディオム
keep one's mouth shut|keep|mouth|shut
v. phr.,
informal To be or stay silent.

A rude expression when used as a command.
When the crooks were captured by the police, their leader warned them to keep their mouths shut. Charles began to tell Barry how to kick the ball, and Barry said angrily, "Keep your mouth shut!" Synonym: SHUT UP
1.
keep one's aperture shut|keep|mouth|shut
v. phr.,
informal To be or break silent.

A abrupt announcement back acclimated as a command.
When the crooks were captured by the police, their baton warned them to accumulate their mouths shut. Charles began to acquaint Barry how to bang the ball, and Barry said angrily, "Keep your aperture shut!" Synonym: SHUT UP
1. Dictionary