English Explanatory Dictionary

once in a blue moon

English dictionary entry

Meanings

adv
  1. Very rarely; very infrequently.

Pronunciation

/wʌns ɪn ə bluː muːn/ en-au-once in a blue moon.ogg

Word forms

once in a blue moon

Etymology

See blue moon. First use appears c. 1833. See citation below.

Synonyms

once in a purple moon rarely seldom infrequently scarcely seldomly uncommonly unoften

Related words

never event once-in-a-lifetime
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