once in a blue moon

adverb

Roget 83: unconformably etc. adj.; except, unless, save barring, beside, without, save and except, let alone.    however, yet, but.    once in a blue moon, once in a million years.    ... show more

Roget 137: seldom, rarely, scarcely, hardly; not often, not much, infrequently, unfrequently^†, unoften^†; scarcely, scarcely ever, hardly ever; once in a blue moon.    once; once in a blue moon; once in a million years; once for all, once in a way; pro hac vice [Lat.].    ... show more

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