darkening

/D AA1 R K AH0 N IH0 NG/
verb
  1. 1

    To make dark or darker by reducing light.

  2. 2

    To become dark or darker (having less light).

  3. 3

    To get dark (referring to the sky, either in the evening or as a result of cloud).

  4. 4

    To make dark or darker in colour.

  5. 5

    To become dark or darker in colour.

  6. 6

    To render gloomy, darker in mood.

  7. 7

    To become gloomy, darker in mood.

  8. 8

    To blind, impair the eyesight.

  9. 9

    To be blinded, lose oneโ€™s eyesight.

  10. 10

    To cloud, obscure, or perplex; to render less clear or intelligible.

  11. 11

    To make foul; to sully; to tarnish.

Synonyms

noun
  1. 1

    The act of something becoming darker.

Source: https://en.wiktionary.org/wiki/darken, https://en.wiktionary.org/wiki/darkening