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blue moon

[ bloo moon ]

Phonetic (Standard)IPA

noun

a second full moon in a month, occurring every two to three years as a result of the discrepancy between a lunar year and a solar year.
(formerly) the third full moon in a season with four full moons instead of the usual three.
a long, indeterminate stretch of time, as between occurrences of a rare event or phenomenon.
an uncommon phenomenon in which the moon appears to have a blue tinge because of the filtering effect of smoke or dust particles in the atmosphere.

blue moon

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First recorded in 1815–25

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Examples have not been reviewed.

Wright: Every blue moon, they would be in a good mood.

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Once in a blue moon, a person is willing to do the hard internal work that leads to real, sustainable change.

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It is also a blue moon but those hoping to see a bluish shade to the satellite are out of luck.

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Every once in a blue moon, our youngest daughter Amma has a Sunday soccer game; in that case, you’ll find me on the sidelines at her game.

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The full moon Aug. 19 will be both a supermoon and a blue moon.

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