From Middle English derkenen, dirkenen, from Old English *deorcnian, *diercnian (“to darken”), equivalent to dark + -en. Cognate with Scots derken, durken (“to darken”), Old High German tarchanjan, terchinen (“to darken”), Middle High German terken, derken (“to darken”).
- (transitive) To make dark or darker by reducing light.
- (intransitive) To become dark or darker (having less light).
- (transitive) To make dark or darker in colour.
- (intransitive) To become dark or darker in colour.
- (transitive) To render gloomy, dark(er) of mood
- (intransitive) To become gloomy, dark of mood
- (transitive) To blind, impair eyesight
- (intransitive) To be blinded, loose clear vision
Derived terms 
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