| 单词 | blue moons | 
| 释义 | blue moonnoun1   : 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 moon — Saturday Rev. 2   : a second full moon in a calendar month   blue moons nounas in monthsa long or seemingly long period of time once in a blue moon we'll get dressed up and eat in a fancy restaurant Synonyms & Similar Words Relevance 
 Antonyms & Near Antonyms 
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