Dunnian

According to the Old English Dictionary:

he dunnaþ,

dunnian

pl. dunniaþ; p. ode; pp. od To make of a dun or a dark colour, to obscure, darken; obscūrāre :-- Se móna ða beorhtan steórran dunnaþ [MS. dunniaþ] the moon obscures the bright stars, Bt. 4; Fox 6, 35. dunnian