Answer: planish

AnswerCrossword Clue
PLANISHFlatten metal by hammering.
PLANISHHammer metal
PLANISHToughen metal by hammering
planishto give a smooth finish to (metal, paper, etc.) by passing through rolls
planishto toughen and smooth by hammering lightly
planishto give a smooth finish to (metal) by striking lightly with a smoothly faced hammer or die