once in a blue moon

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• /wʌns ɪn ə bluː muːn/
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See blue moon. First use appears c. 1833. See citation below.

39 source translations are retained for this English entry.

• Azerbaijani: aydan, ildən bir dəfə — very rarely
• Chinese Cantonese: 千載難逢 /千载难逢 (cin1 zoi2 naan4 fung4) — very rarely
• Chinese Cantonese: 十年唔逢一閏 /十年唔逢一闰 (sap6 nin4 m4 fung4 jat1 jeon6) — very rarely
• Chinese Mandarin: 千載難逢 /千载难逢 (qiānzǎinánféng) — very rarely
• Czech: jednou za uherský rok — very rarely
• Dutch: eens in de zoveel tijd — very rarely
• Esperanto: ege malofte — very rarely
• Finnish: todella harvoin — very rarely
• French: tous les trente-six du mois — very rarely
• French: une fois toutes les lunes — very rarely
• Georgian: ათასში ერთხელ (atasši ertxel) — very rarely
• German: alle Jubeljahre — very rarely
• Greek: στη χάση και στη φέξη (sti chási kai sti féxi) — very rarely
• Irish: uair sna naoi n-aird — very rarely
• Irish: uair umá seach — very rarely
• Italian: una volta ogni morte di papa — very rarely
• Italian: ogni morte di papa — very rarely
• Japanese: ごくまれに (gokumare ni) — very rarely
• Polish: raz na ruski rok — very rarely
• Polish: od wielkiego dzwonu — very rarely
• Portuguese: de vez em nunca — very rarely
• Portuguese: uma vez na vida, outra na morte — very rarely
• Russian: раз в сто ле́т (raz v sto lét) — very rarely
• Scottish Gaelic: uair san ràith — very rarely
• Slovak: raz za uhorský rok — very rarely
• Spanish: cada muerte de obispo — very rarely
• Spanish: de guindas a brevas — very rarely
• Spanish: de higos a brevas — very rarely
• Spanish: de Pascuas a Ramos — very rarely
• Spanish: de ciento a viento — very rarely
• Spanish: de ciento en viento — very rarely
• Spanish: una vez a las quinientas — very rarely
• Spanish: muy de vez en cuando — very rarely
• Tamil: அத்தி பூத்தாற் போல் (atti pūttāṟ pōl) — very rarely
• Tamil: ஆடிக்கு ஒரு முறை அமாவாசைக்கு ஒரு முறை (āṭikku oru muṟai amāvācaikku oru muṟai) — very rarely
• Thai: มากไม่ค่อย — very rarely
• Turkish: kırk yılda bir — very rarely
• Vietnamese: năm thì mười hoạ — very rarely
• Welsh: unwaith yn y pedwar amser — very rarely