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face-harden

[ feys-hahr-dn ]

verb (used with object)

  1. to harden the surface of (metal), as by chilling or casehardening.


face-harden

verb

  1. tr to harden the surface of (steel or iron) by the addition of carbon at high temperature
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of face-harden1

First recorded in 1895–1900

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