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English definition of “once in a blue moon”

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once in a blue moon

rarely: Once in a blue moon he’d call, but for months at a time we heard nothing.
Translations of “once in a blue moon”
in Chinese (Traditional) 少有地…
in Russian раз в год по обещанию, очень редко…
in Turkish ayda yılda bir, kırk yılda bir, (argo) ölme eşeğim ölme…
in Chinese (Simplified) 少有地…
in Polish raz na ruski rok…
(Definition of once in a blue moon from the Cambridge Academic Content Dictionary © Cambridge University Press)
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