definition of
discolor

[1] #1 discolor v. lose color or turn colorless; "The painting discolored". wn

[2] #2 discolor v. cause to lose or change color; "The detergent discolored my shirts". wn

[3] #3 discolor v. [discolour, colour, color] change color, often in an undesired manner; "The shirts discolored". wn