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tr.v. plan·ished, plan·ish·ing, plan·ish·es
To smooth (metal) by rolling or hammering.

[Middle English *planishen, from Old French planir, planiss-, to make smooth, from plan, level, from Latin plānus; see pelə- in Indo-European roots.]

plan′ish·er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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It was mostly the toolbox that contained square-aced, peening and planishing hammers, straight and bent snips, left and right-hand shears, loaf weights and many other weird and wonderful names.
The first process is planishing the weld joint so the weld buildup is reduced to less than 10% of the parent metal thickness.
On the green itself, a forge planishing hammer from the Isaac Nash factory serves as a reminder of the village's industrial heritage.