very rarely
once after a long time
something that happens very seldom
on rare occasions
almost never
hardly ever
The earthquakes hits once in a blue moon in this part of the earth, we never felt it.
I don’t know why she bought that music system – she uses it once in a blue moon.
“I think my grandson doesn’t love me anymore, he comes to see me only once in a blue moon.”
My Dad is working in Scotland and he visits home once in a blue moon, every couple of years.
Although I trust in God, I visit that famous temple only once in a blue moon.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.