To shape metal by striking it, especially with a peen.
noun
1
A needle without an eye (usually) made of drawn-out steel wire with one end sharpened and the other flattened or rounded into a head, used for fastening.
2
A small nail with a head and a sharp point.
3
A cylinder often of wood or metal used to fasten or as a bearing between two parts.
Pull the pin out of the grenade before throwing it at the enemy.
4
The victory condition of holding the opponent's shoulders on the wrestling mat for a prescribed period of time.