Definitions from Wiktionary ( )

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

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