When we want to say that something only happens very rarely, we say:
‘… once in a blue moon.’
A blue moon isn’t something you see very often; hence, ‘once in a blue moon’ has come to mean that something happens very rarely. ‘As the crow flies’ (in a straight line) is used to describe distances. ‘Every other day’ (every two days) and ‘around the clock’ (all the time) would indicate that we drink too much coffee and that we never have enough to keep us going. Now, where’s my coffee?
Once in a blue moon, I can enjoy jazz; but I’m not really a fan.
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