From The Collaborative International Dictionary of English v.0.48:
Chap \Chap\ (ch[o^]p), n. [OE. chaft; of Scand. origin; cf. Icel kjaptr jaw, Sw. K[aum]ft, D. ki[ae]ft; akin to G. kiefer, and E. jowl. Cf. Chops.] 1. One of the jaws or the fleshy covering of a jaw; -- commonly in the plural, and used of animals, and colloquially of human beings. [1913 Webster]
His chaps were all besmeared with crimson blood. --Cowley. [1913 Webster]
He unseamed him [Macdonald] from the nave to the chaps. --Shak. [1913 Webster]
2. One of the jaws or cheeks of a vise, etc. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Chap \Chap\ (ch[a^]p or ch[o^]p), v. t. [imp. & p. p. Chapped (ch[a^]pt or ch[o^]pt); p. pr. & vb. n. Chapping.] [See Chop to cut.] 1. To cause to open in slits or chinks; to split; to cause the skin of to crack or become rough. [1913 Webster]
Then would unbalanced heat licentious reign, Crack the dry hill, and chap the russet plain. --Blackmore. [1913 Webster]
Nor winter's blast chap her fair face. --Lyly. [1913 Webster]
2. To strike; to beat. [Scot.] [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Chap \Chap\, v. i. 1. To crack or open in slits; as, the earth chaps; the hands chap. [1913 Webster]
2. To strike; to knock; to rap. [Scot.] [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Chap \Chap\, n. [From Chap, v. t. & i.] 1. A cleft, crack, or chink, as in the surface of the earth, or in the skin. [1913 Webster]
2. A division; a breach, as in a party. [Obs.] [1913 Webster]
Many clefts and chaps in our council board. --T. Fuller. [1913 Webster]
3. A blow; a rap. [Scot.] [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Chap \Chap\ (ch[a^]p), n. [Perh. abbreviated fr. chapman, but used in a more general sense; or cf. Dan. ki[ae]ft jaw, person, E. chap jaw.] 1. A buyer; a chapman. [Obs.] [1913 Webster]
If you want to sell, here is your chap. --Steele. [1913 Webster]
2. A man or boy; a youth; a fellow. [Colloq.] [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Chap \Chap\, v. i. [See Cheapen.] To bargain; to buy. [Obs.] [1913 Webster]