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Definition of discolor verb from the Oxford Advanced American Dictionary

 

discolor

 verb
(Canadian English usually discolour) verb
NAmE//dɪsˈkʌlər//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they discolor (Canadian English usually)discolour he / she / it discolors (Canadian English usually)discolours past simple discolored (Canadian English usually)discoloured -ing form discoloring (Canadian English usually)discolouring
 
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to change color, or to make the color of something change, in a way that makes it look less attractive Plastic tends to discolor with age. discolor something The pipes were beginning to rust, discoloring the water.