Verb blacken has 2 senses
  1. blacken, melanize, melanise, nigrify, black - make or become black; "The smoke blackened the ceiling"; "The ceiling blackened"
    --1 is one way to discolor, discolour, colour, color
    Antonyms: whiten, white
    Sample sentences:
    Something ----s
    Somebody ----s something
    Something ----s something
  2. char, blacken, scorch - burn slightly and superficially so as to affect color; "The cook blackened the chicken breast"; "The fire charred the ceiling above the mantelpiece"; "the flames scorched the ceiling"
    --2 is one way to burn
    Sample sentences:
    Somebody ----s something
    Something ----s something
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