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Definition of blue moon in English: blue moonnoun 1A phenomenon whereby the moon appears bluish owing to smoke or dust particles in the atmosphere. people saw blue moons for years after the 1883 eruption of Krakatoa 2A second full moon in a calendar month. tomorrow's full moon is a blue moon as modifier it can be no coincidence that July is a blue moon month
Phrases he comes round once in a blue moon Synonyms hardly ever, almost never, scarcely ever, rarely, very seldom
Definition of blue moon in US English: blue moonnoun 1A phenomenon whereby the moon appears bluish owing to smoke or dust particles in the atmosphere. people saw blue moons for years after the 1883 eruption of Krakatoa 2A second full moon in a calendar month. tomorrow's full moon is a blue moon as modifier it can be no coincidence that July is a blue moon month
Phrases he comes around once in a blue moon Synonyms hardly ever, almost never, scarcely ever, rarely, very seldom
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