case-harden
case–hard·en
verb \ˈkās-ˌhär-dən\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
— case–hard·ened adjective
First Known Use of CASE-HARDEN
1677
Rhymes with CASE-HARDEN
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