A variant of CHAMFER: in both senses.

1

1817.  J. Puckle, Club, § 410. 77. The hollows above their [coursers’] brows, their champers, narrils, mouths, necks.

2

1854.  H. Miller, Sch. & Schm., xiii. (1858), 277. Along the edges of their upper beds he struck off a small rude champer.

3