1. the rounded or wedge-shaped end of a hammerhead opposite the striking face

1. to hammer, shape, or flatten with the peen of a hammer

Examples

• The blacksmith used the peen of his hammer to shape the metal.
• A ball-peen hammer has a rounded peen on one end.
• The carpenter’s hammer had a straight peen for driving nails into tight spaces.
• He peened the rivet to secure the metal plates together.
• The metalworker peened the copper sheet to make it thinner.
• She carefully peened the edge of the blade to sharpen it.