case-harden
verb
case-hard·en
ˈkās-ˌhär-dᵊn
case-hardened; case-hardening; case-hardens
1
: to harden (a ferrous alloy) so that the surface layer is harder than the interior
2
: to make callous or insensible
case-hardened
adjective
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Merriam-Webster unabridged
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