blue moon

Definition of blue moon

blue moon´
1.The second full moon occurring in the same month; - derived from the expression once in a blue moon; as, we had a blue moon on January 31, 1999, and another in March.
once in a blue moon
very rarely; - from the observation that the moon rarely has a bluish tint.

Related Words

age, colloquialism, long time, years
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blue jeans
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-blue moon-
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Blue verditer
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