darkening

verb

1
To make dark or darker by reducing light.
2
To become dark or darker (having less light).
3
To get dark (referring to the sky, either in the evening or as a result of cloud).
4
To make dark or darker in colour.
5
To become dark or darker in colour.
6
To render gloomy, darker in mood.
7
To become gloomy, darker in mood.
8
To blind, impair the eyesight.
9
To be blinded, lose one’s eyesight.
10
To cloud, obscure, or perplex; to render less clear or intelligible.
11
To make foul; to sully; to tarnish.

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