| Word | once in a blue moon |
|---|---|
| Description | very rarely practically never – informal The colour blue was an arbitrary choice in this phrase. To say that the moon is blue is recorded in the 16th century as a way of indicating that something could not be true. very rarely practically never – informal The colour blue was an arbitrary choice in this phrase. To say that the moon is blue is recorded in the 16th century as a way of indicating that |
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