v. Obs.1 [ME. forhardien (trans.), OE. forheardian (intr.), f. FOR- pref.1 + heardian to become or make hard.] trans. To harden.

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c. 1250.  Gen. & Ex., 3337.

        For it [sc. the manna] malt at ðe sunne-sine,
Oc oðer fir for-hardede [printed forhadede] hine.

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