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synonyms
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once a blue moon

  • as innow and then
  • as inoccasionally
  • as inon and off
  • as inonce in a while
  • as inseldom
  • as insometimes
  • as insporadically
  • as inhardly
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Synonyms for once a blue moon

adv once in a while
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.