n
1 [U] action of putting colour on sth 给某物着色; 上色; 染色; 涂色
*Children enjoy colouring, eg with crayons. 儿童都喜欢涂颜色（如用蜡笔）.
* [attrib 作定语] a colouring book （为练习涂色用的）空白画册.
2 [U]
(a) way or style in which sth is coloured 着色法.
(b) way in which an artist uses colour in paintings （艺术家在绘画中的）用色风格, 色调.
3 [U] colour of a person's skin; complexion 肤色; 面色
*She has
(a) very fair colouring. 她面色白皙.
4 [C, U] (type of) substance used to give a particular colour to sth, esp to food 着色剂（尤指用于食物的）
*This yoghurt contains no artificial flavouring or colouring. 这种酸乳酪不含人造香料或着色剂.

n
[U and C]
a substance used to give a particular colour to food
　green food colouring
[U]
the activity of putting colours into drawings, or of drawing using crayons, coloured pencils etc
　a children's colouring competition
[U]
the colour of someone's skin, hair, and eyes
　Mandy has her mother's fair coloring.
[U]
the colours of an animal, bird, or plant