blue moon

1. An extra full moon that appears in a subdivision of a year, namely:

   (countable, uncountable)The third full moon in a season that contains four rather than the usual three full moons.

   голуба́я луна́golubája luná

2. (countable, uncountable)The second of two full moons that occur in the same calendar month (a definition created by mistake in the 20th century).

3. (countable, rare)The moon tinted towards blue as it appears in the sky, caused by dust or smoke in the atmosphere.

4. (broadly, countable, idiomatic)A long time.

   a long time

5. (uncountable)A bright blue, sweet-flavored ice cream that is popular in the Midwestern U.S. and is a component of Superman ice cream.

   Schlumpfeis

1. We only do this once in a blue moon.

   Ми робимо це раз на п'ятирічку. — deniko

   ruМы это делаем раз в столетие. — marafon

   deDas machen wir nur alle Jubeljahre einmal. — Pfirsichbaeumchen

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2. Tom only comes to visit once in a blue moon.

   ruТом навещает нас раз в сто лет. — marafon

   deTom kommt nur alle Jubeljahre zu Besuch. — Pfirsichbaeumchen

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3. I study once in a blue moon.

   ruЯ занимаюсь раз в пятилетку. — Lenin_1917

   deIch lerne alle heiligen Zeiten mal. — Dani6187

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4. We talk once in a blue moon.

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5. I only come once in a blue moon.

   deIch komme nur einmal alle Jubeljahre. — Dejo

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regular