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blue moon Hear it!

blue moon definition

blue moon

a very long time

Etymology: < a rare atmospheric condition in which layers of smoke, dust, etc., as from forest fires, volcanoes, etc., cause the surface of the moon to appear to be blue

blue moon Idioms

once in a blue moon

very seldom; almost never

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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Once in a blue moon225 years ago
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