One of the mysteries of the English language finally explained.
Flatten (sheet metal) with a smooth-faced hammer or between rollers.
- ‘To obtain full strength, the metastable beta alloys are welded in the annealed condition; the weld is cold worked by planishing, and the weldment is then solution treated and aged.’
- ‘Once I got the shape I wanted, I then planished the metal to smooth out the bumps and wrinkles.’
Late Middle English (in the sense ‘make level’): from obsolete French planiss-, lengthened stem of planir ‘to smooth’, from plain ‘smooth, level’.
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