American Dictionary of the English Language

CHAP, verb transitive To cleave, split, crack, or open longitudinally, as the surface of the earth, or the skin and flesh of the hand. Dry weather chaps the earth; cold dry winds chap the hands.

CHAP, verb intransitive To crack; to open in long slits; as, the earth chaps; the hands chap

CHAP, noun A longitudinal cleft, gap or chink, as in the surface of the earth, or in the hands or feet.

CHAP, noun The upper and lower part of the mouth; the jaw. It is applied to beasts, and vulgarly to men; generally in the plural, the chaps or mouth.

CHAP, verb intransitive To cheapen.