Colour idioms


be in the red

If you or your bank account are in the red, you owe money to the bank

see red to become very angry


once in a blue moon not very often

My sister lives in Alaska, so I only see her once in a blue moon.


using the imagination to think of ideas that do not yet have practical uses or make money:  Blue-sky thinking involves a group of people looking at an opportunity with fresh eyes.

out of the blue

If something happens out of the blue, it is completely unexpected:

One day, out of the blue, she announced that she was leaving.


be green with envy

to be very unhappy because someone has something that you want:

Chad is heading off to Spain for the week, and I'm green with envy.

green fingers (UK) / green thumb (US) the ability to make plants grow

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once in a blue moon

green thumb