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third-person singular simple present planishes, present participle planishing, simple past and past participle planished
(transitive) To repeatedly hammer (a sheet of metal) so as to shape and smooth it or create a decorative indented finish. quotations examples
Although much of the copperwork done in school workshops is planished only once, many craftsmen planish their work three or four times in order to get a perfect finish.
2014, P. F. Lye, Metalwork Theory, page 35