What is the meaning of colouring?

noun

• A digestible substance used to give color to food.
  • usage: "food color made from vegetable dyes"
  • synonyms: coloring, food coloring, food colouring, food color, food colour
• A visual attribute of things that results from the light they emit or transmit or reflect.
  • usage: "a white color is made up of many different wavelengths of light"
  • synonyms: color, colour, coloring
• The act or process of changing the color of something.
  • synonyms: coloring

verb

• Modify or bias.
  • usage: "His political ideas color his lectures"
  • synonyms: color, colour
• Decorate with colors.
  • usage: "color the walls with paint in warm tones"
  • synonyms: color, colour, emblazon
• Give a deceptive explanation or excuse for.
  • usage: "color a lie"
  • synonyms: color, colour, gloss
• Affect as in thought or feeling.
  • usage: "My personal feelings color my judgment in this case"; "The sadness tinged his life"
  • synonyms: tinge, color, colour, distort
• Add color to.
  • usage: "The child colored the drawings"; "Fall colored the trees"; "colorize black and white film"
  • synonyms: color, colorize, colorise, colourise, colourize, colour, color in, colour in
• Change color, often in an undesired manner.
  • usage: "The shirts discolored"
  • synonyms: discolor, discolour, colour, color