once in a blue moon

This page is about the idiom once in a blue moon.

Meaning: If something happens once in a blue moon, it happens very rarely.

For example:

  • We hardly ever go out these days, though once in a blue moon we might go and see a movie.

  • My daughter lives in Brazil and she only comes to see us once in a blue moon; maybe every two or three years if we're lucky.

Quick Quiz:

We live in a town in the desert now. It's hot and dry most days, and once in a blue moon it will

a. be sunny all day

b. rain quite a lot

c. be cooler at night

Idiom of the Day

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Contributor: Matt Errey