discolour
1. [ verb ] (color) change color, often in an undesired manner
Synonyms: colour color discolor
Examples:

"The shirts discolored"

Related terms: change turn blush blacken yellow whiten dye pale sunburn blue silver tan redden green gray tone purple color stain coloring discoloration
Similar spelling:   discoloured
  discolourise
  discolor
  discolored
  discolorize
  discolorise
  dichloride
  decolour