once in a blue moon

It only happens every once in a blue moon.

I read books once in a blue moon.

They stand there for weeks and months, and possibly only once in a blue moon does anyone come to remove them.

Those who do one once in a blue moon inevitably do not produce quite the same results.

There might be, once in a blue moon, but nine times out of ten a boundary change harms either one party or another.

But no one plays billiards except for once in a blue moon; it is too eccentric to decide to have a game of billiards.

This is not something which happens once in a blue moon.

Soon it will be once every 10 years and then once in a blue moon.

He was subject to petit mal attacks once in a blue moon.

However, it is only once in a blue moon that we have a chance to restructure and overhaul the system of agricultural holdings.

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I wonder whether this might be an opportunity for saying that just once in a blue moon we can afford to do them.

A racing tipster studying all the form, receiving information and going through the card on any day happens once in a blue moon.

It is like eating, drinking and sleeping, but it happens only once in a blue moon.

That is where the “once in a blue moon” comes in.

Although they do not amount to once in a blue moon, they get very close to that situation.