v. Obs. In 5 formerken. [f. FOR- pref.1 + MIRKEN v.] intr. To darken.

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c. 1430.  Chev. Assigne, 362.

        And alle his feyre federes · fomede vpon blode,
And alle formerknes þe watur · þer þe swanne swymmethe.

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