0 the mouth and nose of an animal, especially a dog: --
2 to put a muzzle on an animal: --
Dangerous dogs should be muzzled.
3 to stop a person or organization from expressing independent opinions: --
The new Secrecy Act will muzzle the media and the opposition.
4 the mouth and nose of an animal, esp. a dog or a horse, or a covering put over this in order to prevent the animal from biting --
5 the end of a gun barrel (= the cylindrical part of a gun), where the bullets come out --