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discolour

British  
/ dɪsˈkʌlə /

verb

  1. to change or cause to change in colour; fade or stain

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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When this occurs, blue-green algae can form blooms that discolour the water, or produce floating mats or scums on the water's surface.

From BBC Sep. 9, 2025

When this occurs, the algae can form blooms that discolour the water or produce floating mats or scums on the water’s surface.

From BBC Sep. 13, 2024

Do not cook for too long after adding the spinach paste as it will discolour and render the dish unappetising in appearance.

From The Guardian Apr. 27, 2016

Frost, wind, rain and drought can discolour and blemish produce but there is no loss of nutrients.

From The Guardian Sep. 27, 2012

One day of it, like one drop of the other, will so affect and discolour the views, the aims, the desire of the mind, that it will thereafter remain forever dyed.

From Sister Carrie: a Novel by Dreiser, Theodore

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