dusken

Etymology

From dusk + -en.

dusken means to make dusky or obscure. Lexicurio rates it Sui generis — a strength score of 87 out of 100.

verb

To make dusky or obscure.“It was last seen and heard of by some macgillic-cuddies above a lonely valley of their reeks, duskening the greylight as it flew, its cry echechohoing among the anfractuosities: pour la dernière fois,' The blackbulled ones, stampeding, drew in their horns, all appailed and much upset, which explaints the guttermilk on their overcoats.”
To grow or become dusky.“Noble you must be: noble too am I / If true the tale that Danewulf loves to tell / When twilight duskens round the crackling logs”