a wedgelike, spherical, or other striking end of a hammer head opposite the face.
verb (used with object)
to enlarge, straighten, or smooth with a peen.
to strengthen (a metal surface) by light hammering or by bombardment with steel balls or shot.
Origin of peen
1505–15; earlier pen < Scandinavian; compare Swedish, Norwegian pen (noun) in same sense (perhaps < German Pinne peen). See pin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the end of a hammer head opposite the striking face, often rounded or wedge-shaped
(tr) to strike with the peen of a hammer or with a stream of metal shot in order to bend or shape (a sheet of metal)
Word Origin for peen
C17: variant of pane, perhaps from French panne, ultimately from Latin pinna point
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
1680s, "sharp or thin end of a hammer head, opposite the face," probably from a Scandinavian source (cf. Norwegian dialectal penn "peen," Old Swedish pæna "beat iron thin with a hammer"). Earlier as a verb, "to beat thin with a hammer" (1510s).
Online Etymology Dictionary, © 2010 Douglas Harper