once in a blue moon

English

See blue moon.

IPA^(key): /wʌns ɪn ə bluː muːn/

once in a blue moon (not comparable)

very rarely

Chinese:
Cantonese: 千載難逢, 千载难逢 (cin¹ zoi² naan⁴ fung⁴), 十年唔逢一閏, 十年唔逢一闰 (sap⁶ nin⁴ m⁴ fung⁴ jat¹ jeon⁶)
Mandarin: 千載難逢 (zh), 千载难逢 (zh) (qiānzǎinánféng)
Czech: jednou za uherský rok (cs)
Finnish: todella harvoin
French: tous les trente-six du mois (fr) (on every thirty-sixth day of the month)
Georgian: ათასში ერთხელ (atasši ertxel)
German: alle Jubeljahre (de)
Greek: στη χάση και στη φέξη (el) (sti chási kai sti féxi)
Italian: una volta ogni morte di papa, ogni morte di papa

Japanese: ごくまれに (gokumare ni)
Polish: raz na ruski rok (pl), od wielkiego dzwonu (pl)
Portuguese: de vez em nunca
Russian: раз в сто ле́т (raz v sto lét) (once every hundred years)
Scottish Gaelic: uair san ràith
Slovak: raz za uhorský rok
Spanish: cada muerte de obispo (es), de guindas a brevas, de higos a brevas, de Pascuas a Ramos (es), de ciento a viento (es), de ciento en viento (es)
Thai: มากไม่ค่อย
Turkish: kırk yılda bir