the nose and mouth of an animal, especially a dog or a horse （狗、马等动物的）口鼻 
She stood by the pony, stroking its muzzle. 她站在小马旁边，抚摸着它的枪口。
a device made of leather or plastic that you put over the nose and mouth of an animal, especially a dog, to prevent it from biting people （防止动物咬人的）口套，鼻笼 the open end of a gun, where the bullets come out 枪口；炮口 Bright muzzle flashes were visible even through the fog. 即使在雾中也可以看到明亮的枪口闪烁。
Word Originlate Middle English: from Old French musel, diminutive of medieval Latin musum, of unknown ultimate origin.