case-harden

verb

case-hard·en | \ˈkās-ˌhär-dᵊn

\

case-hardened; case-hardening; case-hardens

Definition of case-harden

transitive verb

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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The first known use of case-harden was in 1677

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