122 - Expression: Once in a Blue Moon
American English Podcast
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Once in a Blue Moon
The literal definition of a blue moon is the second full moon in a calendar month. Since full moons appear every 29.53 days, it's actually a rare occurrence to see a blue moon. But don't be deceived, the moon is not blue. It's just referring to the second time that full moon occurs within the month. So you'll see ablue moon once every 33 months or 2.7 years.
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