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case-hard·en | \ ˈkās-ˌhär-dᵊn 
\
\case-hardened; case-hardening; case-hardens
Definition of case-harden
1 : to harden (a ferrous alloy) so that the surface layer is harder than the interior
2 : to make callous or insensible
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Time Traveler for case-harden
The first known use of case-harden was in 1677
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