planish

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To smooth (metal) by rolling or hammering.

Century Dictionary and Cyclopedia

1. To make smooth or plane, as wood.
2. To condense, smooth, and toughen, as a metallic plate, by light blows of a hammer.
3. To polish: as, to planish silver goods or tin-plate.

Wiktionary

1. v. To repeatedly hammer (a sheet of metal) so as to shape and smooth it or create a decorative indented finish.

GNU Webster's 1913

1. v. To make smooth or plane, as a metallic surface; to condense, toughen, and polish by light blows with a hammer.