muzzle
noun
°the protruding part of many animal's head which includes nose, mouth and jaws; snout.
°the mouth or the end for entrance or discharge of a gun, pistol etc., that the bullet emerges from as opposed to the breech.
verb
°to bind or confine animal's mouth by putting a muzzle, as to prevent it from eating or biting.
°to restrain (from speaking, expressing opinion or acting); gag, silence.