1
- the projecting part of the face, including the nose and mouth, of an animal such as a dog or horse（犬、马等动物的）鼻口部; 吻。
1.1
- a guard, typically made of straps or wire, fitted over this part of an animal's face to stop it biting or feeding（动物的）口套。
1.2
- informal the part of a person's face including the nose, mouth, and chin〈非正式〉（人的）鼻、口、颏部分。
2
- the open end of the barrel of a firearm枪口; 炮口：
Devlin jammed the muzzle of the gun into the man's neck.
德夫林将枪口紧紧抵住那人的脖子。
with obj.
1- put a muzzle on (an animal)给（动物）上口套。
1.1
- figurative prevent (a person or an institution, especially the press) from expressing their opinions freely〈喻〉使（人, 机构, 尤指新闻机构）缄默; 钳制…的言论：
the politicians want to muzzle us and control what we write.
政客们想钳制我们的言论并控制我们写的东西。
词源
late Middle English: from Old French musel, diminutive of medieval Latin musum, of unknown ultimate origin.