GNU Dico
From GNU Collaborative International Dictionary of English, version 0.54:
Muzzle, v. t. [imp. & p. p. Muzzled (?); p. pr. & vb. n. Muzzling (?).] [F. museler.]
1. To bind the mouth of; to fasten the mouth of, so as to prevent biting or eating; hence, figuratively, to bind; to sheathe; to restrain from speech or action; as, “the dictator muzzled all the newspapers”. “My dagger muzzled.”
Shak.
[1913 Webster]
Thou shalt not muzzle the ox when he treadeth out the corn.
-- Deut. xxv. 4.
[1913 Webster]
2. To fondle with the closed mouth. [Obs.]
L'Estrange.
[1913 Webster]