Blue moon
Blue moon noun - A long or seemingly long period of time.
Day
Mutual synonyms
Both terms in one sentence
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In the first movie, it appears in the Forbidden Falls during a blue moon, opening a portal between the medieval-past Smurf Forest and present-day New York City.
Source: Portal Pool -
Inverted in Blue Moon Rising, where the prince who rides forth to battle a dragon is able to do so on a unicorn, having been forced to live chastely so he won't father a child who might one day contest his older brother's throne.
Source: A Man Is Not a Virgin
Cite this Source
Day and Blue moon. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/blue_moon/day
Blue moon & Day. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/blue_moon/day>.
Day or Blue moon. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/blue_moon/day.
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