verb (v)

• lose color or turn colorless(verb.change)

  Example:
  The painting discolored.
  

  Antonym:
  color, color in, colorise, colorize, colour, colour in, colourise, colourize
  

  source: wordnet30
• cause to lose or change color(verb.change)

  Example:
  The detergent discolored my shirts.
  

  source: wordnet30
• change color, often in an undesired manner(verb.change)

  Example:
  The shirts discolored.
  

  Synonym:
  color, colour, discolour
  

  source: wordnet30
• To alter the natural hue or color of; to change to a different color; to stain; to tinge; as, a drop of wine will discolor water; silver is discolored by sea water.(verb)

  source: webster1913