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Verb: discolor  dis'kú-lur
Usage: US (elsewhere: discolour)
  1. Lose color or turn colorless
    "The painting discolored";
    - discolour [Brit, Cdn]
  2. Cause to lose or change color
    "The detergent discolored my shirts";
    - discolour [Brit, Cdn]
  3. Change color, often in an undesired manner
    "The shirts discolored";
    - discolour [Brit, Cdn], colour [Brit, Cdn], color [US]

Derived forms: discoloring, discolored, discolors

Type of: alter, change, modify

Antonym: colorise [Brit]