1. changing or causing to change color, especially to an undesirable or faded color
Usage: present participle of discolor

1. the process or result of changing color in an undesirable way

Examples

• The old photograph is discoloring with age.
• Sunlight was discoloring the fabric on the couch.
• The discoloring of the leaves indicated disease.
• She noticed discoloring around the edges of the painting.
• The medication is discoloring his teeth.
• Heat from the stove was discoloring the wall behind it.
• The discoloring happened gradually over several months.