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peen

[peen] /pin/
noun
1.
a wedgelike, spherical, or other striking end of a hammer head opposite the face.
verb (used with object)
2.
to enlarge, straighten, or smooth with a peen.
3.
to strengthen (a metal surface) by light hammering or by bombardment with steel balls or shot.
Origin
1505-1515
1505-15; earlier pen < Scandinavian; compare Swedish, Norwegian pen (noun) in same sense (perhaps < German Pinne peen). See pin
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for peening

peen

/piːn/
noun
1.
the end of a hammer head opposite the striking face, often rounded or wedge-shaped
verb
2.
(transitive) 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
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
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Word Origin and History for peening

peen

n.

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
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