once in a purple moon
An extremely rare occurrence, rarer than 'once in a blue moon'.
A particular team winning the championship happens once in a purple moon. A total solar eclipse seen from Europe happens once in a purple moon.
| 俚语 | once in a purple moon |
| 释义 | once in a purple moonAn extremely rare occurrence, rarer than 'once in a blue moon'. A particular team winning the championship happens once in a purple moon. A total solar eclipse seen from Europe happens once in a purple moon. |
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