darkening

Noun
  1. Changing to a darker color (synset 100275281)
    is a type of: change of color - an act that changes the light that something reflects
    subtypes: obfuscation - darkening or obscuring the sight of something
    same as: blackening
Adjective
  1. Becoming dark or darker as from waning light or clouding over (synset 300275699)
    "the darkening sky"
    similar to: dark - devoid of or deficient in light or brightness; shadowed or black

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