A variant of CHAMFER: in both senses.
1817. J. Puckle, Club, § 410. 77. The hollows above their [coursers] brows, their champers, narrils, mouths, necks.
1854. H. Miller, Sch. & Schm., xiii. (1858), 277. Along the edges of their upper beds he struck off a small rude champer.