English version

once in a blue moon

From Longman Dictionary of Contemporary Englishonce in a blue moononce in a blue mooninformalRARELY very rarely It only happens like this once in a blue moon. once
Examples from the Corpus
once in a blue moonI used to spend a lot of time in London, but now I only go there once in a blue moon.We go out to eat once in a blue moon.And Eleanor was damn lucky to have him as an escort once in a blue moon.So now he just comes round once in a blue moon.Once in a blue moon Eric will offer to help with the dishes, but usually he doesn't do any housework at all.That happens only once in a blue moon, when the weather is cold enough and thus the ice thick enough.
Pictures of the day
Do you know what each of these is called?
Click on the pictures to check.