Peen

peen \ˈpēn\ noun: a usually hemispherical or wedge-shaped end of the head of a hammer that is opposite the face and is used especially for bending, shaping or cutting the material struck
transitive verb: to draw, bend or flatten by or as if by hammering with a peen

Etymology: probably of Scandinavian origin; akin to Norwegian penn peen

We all speak of ball-peen hammers, but have we ever considered the peen, really? Consider it now!