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1
on rare occasions(expression, hardly, barely, terrifically)
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APASmart Define. (1970). once in blue moon thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/once_in_blue_moon/thesaurus/synonyms
ChicagoSmart Define. 1970. "once in blue moon thesaurus" https://smartdefine.org/once_in_blue_moon/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 1970, once in blue moon thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/once_in_blue_moon/thesaurus/synonyms>.
MLASmart Define. "once in blue moon thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/once_in_blue_moon/thesaurus/synonyms>