- to make the outside surface of (an alloy having an iron base) hard by carburizing and heat treatment, leaving the interior tough and ductile.
- to harden in spirit so as to render insensible or insensitive to external impressions or influences; make callous.
- to form a hard surface layer of high carbon content on (a steel component) by heating in a carburizing environment with subsequent quenching or heat treatment
- to harden the spirit or disposition of; make callous
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