verb

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