1. to remove or reduce the color from something
Usage: British spelling

Examples

• The harsh sunlight will decolour the fabric over time.
• Chemical treatments can decolour hair effectively.
• Age tends to decolour old photographs.
• The bleaching agent will decolour the stained cloth.
• Exposure to chlorine can decolour swimwear.
• The artist used acid to decolour parts of the print.