(1):

(n.) Foam or froth made by soap moistened with water.

(2):

(v. i.) To form lather, or a froth like lather; to accumulate foam from profuse sweating, as a horse.

(3):

(n.) Foam from profuse sweating, as of a horse.

(4):

(n.) To spread over with lather; as, to lather the face.

(5):

(v. t.) To beat severely with a thong, strap, or the like; to flog.