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From for- +‎ harden. Compare forhard.


forharden (third-person singular simple present forhardens, present participle forhardening, simple past and past participle forhardened)

  1. (transitive) To make hard; harden up.
    • 1572, Golding, Calvin:
      They become forhardened, and shaking of the fears of God, do therewithal cast away the hope of salvation.
    • 2004, M. Kevin Johnson, c-22 to B&W - Film and Processing Forum:
      With the old C-22 chemicals you had to "forharden" the film in order to not have the emulsion come off durring processing.