Definition of work-harden in English:

work-harden

Syllabification: work-hard·en

verb

[with object] (often as noun work-hardening) Metallurgy
  • Toughen (a metal) by cold-working.
    More example sentences
    • Repeated expansion and sizing work-hardens the case and overtime makes it less resilient.
    • The rest of the strength is generated by work-hardening.
    • Machining operations are normally limited to turning and milling because manganese steel work-hardens under load.

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody