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caseharden

[keys-hahr-dn] /ˈkeɪsˌhɑr dn/
verb (used with object)
1.
Metallurgy. to make the outside surface of (an alloy having an iron base) hard by carburizing and heat treatment, leaving the interior tough and ductile.
2.
to harden in spirit so as to render insensible or insensitive to external impressions or influences; make callous.
Origin
1670-1680
1670-80; case2 + harden
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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