Deorcian

According to the Old English Dictionary:

deorcian

Substitute: To become dark, to grow dim (of sight) :-- Deorcaþ gesihð hebet visus, Ps. L. fol. 142, 2. [Hise iȝen derkeden (caligaverant), Wick. i. Sam. 4, 15. N. E. D. dark; vb.] v. á-deorcian. deorcian