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once in a blue moon meaning in French

EnglishFrench
once in a blue moon (very rarely)
adverb
[UK: wʌns ɪn ə bluː muːn]
[US: ˈwəns ɪn ə ˈbluː ˈmuːn]

tous les trente-six du mois [on every thirty-sixth day of the month]◼◼◼adverbe