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English definition of “discolour”

discolour

verb [I or T] uk UK (US discolor)   /dɪˈskʌl.ər/ us    //
to (cause something to) change from the original colour and therefore to look unpleasant: The coal fire had discoloured the paintwork.Colour - general wordsPale and colourless and causing colour to fade
discoloration
noun [C or U] uk   /dɪˌskʌl.əˈreɪ.ʃən/ us  
Colour - general wordsPale and colourless and causing colour to fade
(Definition of discolour from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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