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discolor (v.)

late 14c., "alter the proper or natural color of," from Old French descolorer, from des- (see dis-) + colorer "to color," from Latin colorare "to color, to get tanned," from color "color of the skin, color in general" (see color (n.)). Sense of "become discolored" is from 1550s. Related: Discolored; discoloring.

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Definitions of discolor from WordNet

discolor (v.)
lose color or turn colorless;
The painting discolored
discolor (v.)
cause to lose or change color;
The detergent discolored my shirts
discolor (v.)
change color, often in an undesired manner;
The shirts discolored
Synonyms: discolour / colour / color
From wordnet.princeton.edu