Idiom – Once In A Blue Moon

English Idiom – Once in a blue moon.

Meaning – Very rarely or almost never. If something happens once in a blue moon it happens very infrequently.

The blue moon in this expression has nothing to do with the colour blue. In astronomy a blue moon is the third full moon in a season of four full moons. Seasons (in astronomy) are 3 months long so a fourth moon in a season is a rare event – actually about once every 3 years.

If you are feeling blue (idiom) it means that you are feeling sad.


  • “I just bought myself a fancy new coffee maker. I don’t know why, I only drink a cup of Joe once in a blue moon!”

In The News:

Fisherman’s special lobster find is once in a blue moon


  • Is there an idiom like this in your country?

What is an idiom?

An idiom is a word or phrase that is not taken literally.  An idiom is an expression that cannot be understood from the meanings of its individual words, but has a separate meaning of its own.

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FunkyEnglish is a website that helps you improve your English. We offer quick lessons that teach idiomsslangphrasal verbs and more. Visit our homepage to see our latest articles, or use the menu to find specific content!

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