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once in a blue moon in French

once in a blue moon in French is tous les trente-six du mois, une fois toutes les lunes.

once in a blue moon in French

tous les trente-six du mois
adv
(idiomatic) Very rarely; very infrequently.
une fois toutes les lunes
adv
(idiomatic) Very rarely; very infrequently.
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What is "once in a blue moon" in French?

"once in a blue moon" in French is tous les trente-six du mois, une fois toutes les lunes.

Are there other ways to say "once in a blue moon" in French?

Yes — French has 2 translations listed for "once in a blue moon": tous les trente-six du mois, une fois toutes les lunes.

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Translations from WikDict, CC BY-SA · example sentences from Tatoeba, CC BY 2.0 FR.