Once-in-a-blue-moon Definition

adverb

(idiomatic) Very rarely; very infrequently.

Wiktionary

(archaic) Never.

Wiktionary

Origin of Once-in-a-blue-moon

See blue moon

From Wiktionary

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once-in-a-blue-moon

Words Starting With O and Ending With N

Starts With O & Ends With N Starts With ON & Ends With N Starts With O & Ends With ON

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19 Letter Words 19 Letter Words Starting With O 19 Letter Words Ending With N

Words Near Once-in-a-blue-moon in the Dictionary