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blue moon

blue moon noun
blue moon
noun
Learner's definition of BLUE MOON

once in a blue moon

: very rarely难得有一次;极为罕见

blue moon

noun

1
: a very long period of time
usually used in the phrase once in a blue moon
such people happen along only once in a blue moonSaturday Rev.
2
: a second full moon in a calendar month

Example Sentences

Word History


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