Once in a blue moon
Meaning: Happens very rarely.
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Smart Idioms
PoetryIdiom: a manner of speaking that is natural to native speakers of a language Every language has its own collection of wise sayings. They offer advice about how to live and also transfer some underlying ideas, principles and values of a given culture...
[LII] quīnquāgintā duo
Once in a blue moon
Meaning: Happens very rarely.
