once in a blue moon

English

Etymology

See blue moon.

Pronunciation

  • IPA(key): /wʌns ɪn ə bluː muːn/
  • (file)

Adverb

once in a blue moon (not comparable)

  1. (idiomatic) Very rarely; very infrequently.
    Synonyms: see Thesaurus:rarely
    • 1933, James Hilton, Lost Horizon, published 1973, page 133:
      [T]ime expanded and space contracted, and the name Blue Moon took on a symbolic meaning, as if the future, so delicately plausible, were of a kind that might happen once in a blue moon only.

Translations

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