Dimmian

According to the Old English Dictionary:

dimmian

Substitute: To be or become dim:--Dymme[n]de caligans, Wrt. Voc. ii. 127, 65. Hyt fremað dimgendum eágum tó þý ꝥ seó beorhtnys ágyfen sý, Lch. i. 136, 1. Wið dymgendum eágum, 178, 4. [N. E. D. dim; intrans.: Icel. dimma to become dim, grow dark.] dimmian