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blue moon

noun

Definition of blue moon

  1. 1 :  a very long period of time —usually used in the phrase once in a blue moon <such people happen along only once in a blue moonSaturday Review>

  2. 2 :  a second full moon in a calendar month



Examples of blue moon

  1. <once in a blue moon we'll get dressed up and eat in a fancy restaurant>



1821

First Known Use of blue moon

1821


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