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

Other Words from case-harden

case-hardened adjective

First Known Use of case-harden

1677, in the meaning defined at sense 1

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The first known use of case-harden was in 1677

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