once in a blue moon (Meaning)

once in a blue moon

very rarely

The last time I saw a blue moon was once in a blue moon, many years ago.
The rare celestial event of a blue moon occurs only once in a blue moon.
Every once in a blue moon, I treat myself to something extravagant.
It wasn't until once in a blue moon that we had the opportunity to visit the remote mountain village.
The old oak tree that stood in our backyard once in a blue moon produced acorns.
My grandmother used to bake her famous apple pie only once in a blue moon.
Once in a blue moon, the entire town would gather for a grand celebration.
The elusive snow leopard was spotted once in a blue moon in the rugged mountains.
It feels like once in a blue moon that I can truly relax and enjoy the moment.
The stars aligned so perfectly that we were able to witness a lunar eclipse once in a blue moon.

very rarely

infrequently, little,sometimes, occasionally, rarely, sporadically,never, ne'er, now and then, seldom

often, generally, ever, routinely, usually, ordinarily,frequently, always, endlessly, eternally

The last time I saw a blue moon was once in a blue moon, many years ago.

The rare celestial event of a blue moon occurs only once in a blue moon.

Every once in a blue moon, I treat myself to something extravagant.

It wasn't until once in a blue moon that we had the opportunity to visit the remote mountain village.