Definition of case-harden in English:

case-harden

verb

[WITH OBJECT]
  • 1 Harden the surface of (a material)

    ‘the blades are case-hardened with reinforced backing plates’
    1. 1.1Give a hard surface to (iron or steel) by carburizing it.
      ‘the grade of steel was unsuitable for the type of heat treatment process used to case-harden the gears’
    2. 1.2Make (someone) callous or tough.
      ‘years of surgical experience did not case-harden him to suffering’

Pronunciation:

case-harden

/ˈkāsˌhärdn/