Although they do not amount to once in a blue moon, they get very close to that situation.
That is where the "once in a blue moon" comes in.
It is like eating, drinking and sleeping, but it happens only once in a blue moon.
A racing tipster studying all the form, receiving information and going through the card on any day happens once in a blue moon.
I wonder whether this might be an opportunity for saying that just once in a blue moon we can afford to do them.
However, it is only once in a blue moon that we have a chance to restructure and overhaul the system of agricultural holdings.
He was subject to petit mal attacks once in a blue moon.
Soon it will be once every 10 years and then once in a blue moon.
