| 单词 | once in a blue moon |
| 释义 | once in a blue moonidiom : very rarely It happens once in a blue moon. once in a blue moon phraseas in occasionally not often Once in a blue moon, this car just refuses to start. They only see each other once in a blue moon as they rarely are in the same location at the same time. Synonyms & Similar Words Relevance
Antonyms & Near Antonyms
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