meaning of peen
1.  A round-edged, or hemispherical, end to the head of a hammer or sledge, used to stretch or bend metal by indentation. 
2.  The sharp-edged end of the head of a masons hammer. 
3.  To draw, bend, or straighten, as metal, by blows with the peen of a hammer or sledge. 
4.  the part of a hammerhead opposite the flat striking surface may have various shapes
						 
