case–harden

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verb case–hard·en \ˈkās-ˌhär-dən\

Definition of case–harden

  1. transitive verb
  2. 1 :  to harden (a ferrous alloy) so that the surface layer is harder than the interior

  3. 2 :  to make callous or insensible

case–hardened

adjective

1677

First Known Use of case–harden

1677

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a person who is a bore or nuisance

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