Meaning of the word "once in a blue moon" in English

What does "once in a blue moon" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

once in a blue moon

US /wʌns ɪn ə bluː muːn/
UK /wʌns ɪn ə bluː muːn/
"once in a blue moon" picture

Idiom

1.

very rarely

Example:
I only see my old college friends once in a blue moon.
My brother lives abroad, so we only get to see him once in a blue moon.
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