once in a million years
bijwoord
Roget 83: unconformably etc. adj.; except, unless, save barring, beside, without, save and except, let alone. however, yet, but. ... meer laten zien
Roget 137: seldom, rarely, scarcely, hardly; not often, not much, infrequently, unfrequently†, unoften†; scarcely, scarcely ever, hardly ever; once in a blue moon. once; ... meer laten zien
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