tous les trente-six du moisFrenchPronunciationtous les trente-six du moisLiteral Translation every thirty-six of the monthEquivalentsThis is how you express this idiom across languages and locales.ListMapChinese千載難逢not occurring once in a thousand yearsEnglishOnce in a blue moonItalianOgni morte di PapaOnce every Pope’s deathPolishraz na ruski rokonce in a Russian yearSpanishcada muerte de obispoeach death of a bishopLogin to correlate with other idioms