Usually means: Very rarely; almost never happens.
Definitions Related words Mentions
We found 15 dictionaries that define the word once in a blue moon:

General (13 matching dictionaries)
  1. once in_a_blue_moon: Merriam-Webster.com
  2. once in_a_blue_moon: Oxford Learner's Dictionaries
  3. once in_a_blue_moon: Collins English Dictionary
  4. once in_a_blue_moon: Wordnik
  5. once in_a_blue_moon: Cambridge Advanced Learner's Dictionary
  6. once in_a_blue_moon: Wiktionary
  7. once in_a_blue_moon: Dictionary.com
  8. Once in_a_Blue_Moon (song), Once in a Blue Moon: Wikipedia, the Free Encyclopedia
  9. once in_a_blue_moon: Free Dictionary
  10. once in_a_blue_moon: Dictionary/thesaurus
  11. Once in a blue moon: Phrase Finder

Miscellaneous (1 matching dictionary)
  1. once in_a_blue_moon: Idioms

Slang (1 matching dictionary)
  1. once in_a_blue_moon: Urban Dictionary

Definitions from Wiktionary (once in a blue moon)

adverb:  (idiomatic) Very rarely; very infrequently.

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Words similar to once in a blue moon

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Idioms related to once in a blue moon

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Words that often appear near once in a blue moon

Rhymes of once in a blue moon

Invented words related to once in a blue moon

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