Rarely, almost never
If you say something happens once in a blue moon,
you mean it happens very rarely.
A blue moon is the second of two full moons in the same month, which happens rarely.
He has a very nice car, but he drives once in a blue moon.
A: Does your husband cook for you?
B: Oh, yes, once in a blue moon!
This picture was drawn by Erika Aoyama on April 13, 2005.
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Last modified on May 11, 2005