Verb brighten has 4 senses
  1. brighten, lighten up, lighten - make lighter or brighter; "The paint will brighten the room"
    --1 is one way to change, alter, modify
    Antonyms: darken
    Sample sentences:
    Somebody ----s something
    Something ----s something
  2. clear up, clear, light up, brighten - become clear; "The sky cleared after the storm"
    Sample sentences:
    Something ----s
    It is ----ing
  3. brighten - become brighter; "The sky brightened around noon"; "Her face brightened when she heard the good news"
    --3 is one way to
    change intensity
    Antonyms: darken, dim
    Sample sentences:
    Somebody ----s something
    Something ----s something
  4. brighten, lighten - become brighter; "The sky brightened"
    --4 is one way to change
    Antonyms: darken
    Sample sentence:
    Something ----s
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