Once in a Blue Moon.
English
idiom
Very rarely.
Trusted by1.5M+English learners & teachers worldwide
Very rarely.
Trusted by1.5M+English learners & teachers worldwide
Very rarely — almost never.
When something happens once in a blue moon, it occurs so infrequently it feels almost exceptional.
The phrase refers to the rare occurrence of a second full moon in a single calendar month.
"Every Now and Then"
—
Occasionally but with some regularity — not as rare as once in a blue moon
"From Time to Time"
—
Happening at irregular but not especially rare intervals
"Once in a Blue Moon"
—
Happening very rarely — so infrequently it almost seems exceptional
Did the system just work perfectly on the first try?
Once in a blue moon — enjoy it while it lasts.
When was the last time you went out dancing?
Once in a blue moon — maybe twice a year if I'm lucky.
He never comes to these things.
He shows up once in a blue moon. Don't count on seeing him.
