muzzle

Prevent from speaking out.

Tie a gag around someone's mouth in order to silence them.

Fit with a muzzle.

“muzzle the dog to prevent it from biting strangers”

The open circular discharging end of a gun.

Restraint put into a person's mouth to prevent speaking or shouting.

A leather or wire restraint that fits over an animal's snout (especially a dog's nose and jaws) and prevents it from eating or biting.

Forward projecting part of the head of certain animals; includes the jaws and nose.