1 the nose and mouth of an animal (for example a dog or fox) （狗、狐等动物的）口鼻部 ☞picture on page C1 见C1页插图

2 a cover made of leather or wire that is put over an animal's nose and mouth so that it cannot bite （皮革或金属线制的）动物口套

3 the open end of a gun where the bullets come out 枪口；炮口 muzzle verb [T] (usually passive 通常用于被动语态) Dogs must be kept muzzled. 狗一定要给套口套。