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Meaning of 'Once in a blue moon'

What does the saying 'Once in a blue moon' mean?

Idiom: Once in a blue moon

Meaning:

If something happens once in a blue moon, it happens very rarely indeed.
Country: International English | Subject Area: Colours | Usage Type: Both or All Words Used
All idioms have been editorially reviewed. Submitted idioms may have been edited for correctness and completeness.
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