English
Etymology
See blue moon
Adverb
once in a blue moon
- idiom Occurring very rarely.
- archaic never|Never.
Translations
trans-top|rare
German: alle Jubeljahre
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Slovak: Raz za uhorský rok.
Spanish: cada muerte de obispo
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Related terms
blue moon
Category:Astronomy
ja:once in a blue moon
tr:once in a blue moon
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