Dictionary

blue moon

noun

Definition of BLUE MOON

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
:  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>

First Known Use of BLUE MOON

1821

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