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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“Case-harden.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/case-harden. Accessed 28 Feb. 2021.
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Time Traveler for case-harden
The first known use of case-harden was in 1677
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