ONCE IN A BLUE MOON


Meaning of ONCE IN A BLUE MOON in English

adv. phr. Very rarely; very seldom; almost never. Coin collecting is interesting, hut you find a valuable coin only once in a blue moon. Once in a blue moon someone grows a very pale marigold, but no truly white marigolds have been raised.

American idioms English vocabulary.      Английский словарь американских идиом.