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  1. Oxford Dictionary

    case-harden

    • IPA[ˈkeɪsˌhɑːdn]

    英式

    • v.
      harden the surface of (a material)；give a hard surface to (iron or steel) by carburizing it

    • verb: case-harden, 3rd person present: case-hardens, gerund or present participle: case-hardening, past tense: case-hardened, past participle: case-hardened

    • 釋義

    動詞

    • 1. harden the surface of (a material) the blades are case-hardened with reinforced backing plates
    • ▪ give a hard surface to (iron or steel) by carburizing it the grade of steel was unsuitable for the type of heat treatment used to case-harden the gears
    • ▪ make (someone) callous or tough years of surgical experience did not case-harden him to suffering