Very seldom, scarcely, not very often, hardly ever


  • Some people think that when the bright part of the moon is crescent, the other side of the moon is of blue shade. As this occasion occurs very rarely, the expression “once in a blue moon” originated in the 16th century to refer to something that is very rare.

I go for skydiving once in a blue moon.

Submitted on February 25, 2019

Additional definitions for 'Once in a Blue Moon':

once in a blue moonNever.
once in a blue moonVery rarely; very infrequently.
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jednou za uherský měsíc

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