dis·col·or [ diss kúllər ](past and past participledis·col·ored, present participledis·col·or·ing, 3rd person present singulardis·col·ors)
transitive and intransitive verb
Definition:
change color: to change from the original or desired color and take on an unpleasant, faded, darkened, or dirty appearance, or make something change in this way
[14th century. Directly or via French< medieval Latin discolorare< Latin colorare "to color"]