A good way to learn idioms is by grouping them together by a common theme, such as colours. There are lots of idioms in English that use colours. For example, did you know that someone who likes gardening is often described as 'green-fingered'? Or that 'once in a blue moon' is used to describe something that happens very rarely?
This short video looks at some other colour idioms which are useful to learn to show you have a deeper understanding of the English language.
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