A rare event or occurrence.
This is generally used in the context when some rare event is being addressed or mentioned.
Sample Usage
1)He goes to college once in a blue moon.
2)Raju meets peter once in a blue moon.
3)I hardly meet Mr.kiran, I see him once in a blue moon.
4)Movies of my favorite hero get released once in a blue moon.
5)Politicians acknowledge and meet people once in a blue moon.
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