WordWeb Online

1. Lose colour or turn colourless
   "The painting discoloured";
   - discolor [US]
    
2. Cause to lose or change colour
   "The detergent discoloured my shirts";
   - discolor [US]
    
3. Change colour, often in an undesired manner
   "The shirts discoloured";
   - discolor [US], colour [Brit, Cdn], color [US]

Derived forms: discoloured, discolouring, discolours

Type of: alter, change, modify