0 to make a piece of metal flat and smooth by hitting it with a hammer (= a tool consisting of a heavy piece of metal at the end of a handle) or pressing it between rollers (= tube-shaped objects):
Under the metalsmith's guidance you will planish the spoon with lots of gentle tapping, to achieve a turtleshell effect.
an exquisite hammered silver punch bowl with a planished finish
The best material for this purpose is tinned and planished copper.
In the past, workers would planish sheets by hand, but most experts today make use of pneumatic or electrical machines to quickly and precisely shape metal parts.
