Etymology
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muzzle (n.)

late 14c., mosel, "device put over an animal's mouth to stop it from biting, eating, or rooting," from Old French musel "muzzle," also "snout, nose" (12c., Modern French museau), from muse "muzzle," from Gallo-Roman *musa "snout" (source also of Provençal mus, Old Spanish mus, Italian muso), a word of unknown origin, possibly related to Latin morsus "bite" (but OED finds "serious difficulties" with this).

Meaning "projecting jaws and nose of the head of an animal" is from early 15c.; sense of "open end of a firearm" is recorded from 1560s. Muzzle-loader "gun loaded from the muzzle" (opposed to breech-loader) is by 1858.

muzzle (v.)

"to put a muzzle on, bind or confine the mouth of to prevent from biting or eating," early 15c., moselen, from muzzle (n.). Figurative use, "to gag, silence," is from 1610s. Related: Muzzled; muzzling.

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Definitions of muzzle
1
muzzle (n.)
the open circular discharging end of a gun;
Synonyms: gun muzzle
muzzle (n.)
forward projecting part of the head of certain animals; includes the jaws and nose;
muzzle (n.)
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;
muzzle (n.)
restraint put into a person's mouth to prevent speaking or shouting;
Synonyms: gag
2
muzzle (v.)
fit with a muzzle;
muzzle the dog to prevent it from biting strangers
muzzle (v.)
prevent from speaking out;
Synonyms: gag
muzzle (v.)
tie a gag around someone's mouth in order to silence them;
Synonyms: gag
From wordnet.princeton.edu