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face-harden
[ feys-hahr-dn ]
verb (used with object)
- to harden the surface of (metal), as by chilling or casehardening.
face-harden
verb
- tr to harden the surface of (steel or iron) by the addition of carbon at high temperature
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Word History and Origins
Origin of face-harden1
First recorded in 1895–1900
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