Definition of "discolouring" [discolouring]

• Present participle of discolour. (verb)

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• "Keep some water with a lemon squeezed into it on hand, too, to keep your artichoke from discolouring while you cut."
• "Any discolouring can be removed by polishing the needle with extremely fine sandpaper."
• "Third one looks like a patriotic whale... that's been harpooned and is bleeding to death, slowly discolouring the entire ocean with its blood."