The meaning of Peening and additional information.

Peen(n.) A round-edged, or hemispherical, end to the head of a hammer or sledge, used to stretch or bend metal by indentation.

Peen(n.) The sharp-edged end of the head of a mason's hammer.

Peen(v. t.) To draw, bend, or straighten, as metal, by blows with the peen of a hammer or sledge.