Verb darken has 4 senses
  1. darken - become dark or darker; "The sky darkened"
    --1 is one way to
    change
    Antonyms: brighten, lighten
    Derived form: noun darkening1
    Sample sentence:
    Something ----s
  2. darken, dim - become or make darker; "The screen darkend"; "He darkened the colors by adding brown"
    --2 is one way to change intensity
    Antonyms: brighten
    Derived form: noun darkening1
    Sample sentences:
    Something ----s
    Somebody ----s something
    Something ----s something
  3. darken - tarnish or stain; "a scandal that darkened the family's good name"
    --3 is one way to
    tarnish, stain, maculate, sully, defile
    Sample sentence:
    Something ----s something
  4. darken - make dark or darker; "darken a room"
    --4 is one way to
    change, alter, modify
    Antonyms: brighten, lighten up, lighten
    Derived form: noun darkening1
    Sample sentences:
    Somebody ----s something
    Something ----s something
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