SINCE 1828
case-harden
verb
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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