peen

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peen

the end of a hammer head opposite the striking face, often rounded or wedge-shaped

peen

[pēn]
(design engineering)
The end of a hammer head with a hemispherical, wedge, or other shape; used to bend, indent, or cut.

peen, pean

peen
The end of a hammer opposite the flat hammering face; may terminate in a cone-shaped, rounded, or sharply pointed face.