stop someone's mouth

stop (one's) mouth

obsolete To keep someone from being able to speak, either physically or emotionally. I stopped his mouth with my finger, and told him to be silent for a moment. The bitter sadness stopped my mouth halfway through my speech, and I was unable to say another word for a full minute.
See also: mouth, stop

stop someone's mouth

bribe or otherwise induce a person to keep silent about something.
See also: mouth, stop