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Once in a very long time or takes ages to happen

A "blue moon" is when there is a full moon twice in a calendar month-which IS rare, but occurs, on average, every 2.5 years.

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14y ago

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Why do you use the expression once in the blue moon to mean very rare?

have you ever seen a blue moon? thats why


The definition of the expression once in a blue moon is...?

Seldom; very rarelyType your answer here...


How do you solve MOONCEON?

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