Definitions from Wiktionary (once in a blue moon)
▸ adverb: (idiomatic) Very rarely; very infrequently.
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▸ adverb: (idiomatic) Very rarely; very infrequently.
Similar:
once in a while,
semioccasionally,
seldom,
once in a way,
occasionally,
once in awhile,
fewly,
unfrequently,
once and awhile,
once and a while,
more...
Opposite:
Adjectives:
▸ Words similar to once in a blue moon
▸ Usage examples for once in a blue moon
▸ Idioms related to once in a blue moon
▸ Wikipedia articles (New!)
▸ Words that often appear near once in a blue moon
▸ Rhymes of once in a blue moon
▸ Invented words related to once in a blue moon