To ingrain grime or dirt which is difficult to remove into (something); also (more generally), to make (something) dirty; to soil.
To make foul; to sully; to tarnish.
To become gloomy, darker in mood.
To render gloomy, darker in mood.
To cloud, obscure, or perplex; to render less clear or intelligible.
To become dark or darker (having less light).
To make dark or darker by reducing light.
To make dark or darker in colour.
To blind, impair the eyesight.
To become dark or darker in colour.
To be blinded, lose one’s eyesight.
To get dark (referring to the sky, either in the evening or as a result of cloud).