1. to remove color from something; to make colorless or bleach
Usage: chiefly British spelling; American English typically uses 'decolorize'; transitive verb

Examples

• The strong sunlight will decolourize the fabric over time.
• Chlorine can decolourize plant pigments in the water.
• The chemical treatment decolourized the stained wood.
• Prolonged exposure to UV rays decolourizes many dyes.
• The bleach quickly decolourized the colored paper.