discolour
verb [ I or T ] UK (US discolor) uk/dɪˈskʌl.ər/ us/dɪˈskʌl.ɚ/
（使）褪色，（使）变色
to (cause something to) change from the original colour and therefore to look unpleasant
The fire had discoloured the paintwork. 炉火的烘烤使油漆变了颜色。
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