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once in a blue moon

From Wiktionary

Pronunciation

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

Expression

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Expression
once in a blue moon

  1. (idiom) Something that happens once in a blue moon, is something that rarely happens.
    Once in a blue moon, the teacher won't give us homework.
  2. (old, no longer used) Something that never happens.
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