darken

verb

• To make dark or darker by reducing light.
• To become dark or darker (having less light).
• To get dark (referring to the sky, either in the evening or as a result of cloud).
• To make dark or darker in colour.
• To become dark or darker in colour.
• To render gloomy, darker in mood.
• To become gloomy, darker in mood.
• To blind, impair the eyesight.
• To be blinded, lose one’s eyesight.
• To cloud, obscure, or perplex; to render less clear or intelligible.
• To make foul; to sully; to tarnish.