盈虧えいき Noun Irregular Intransitive English jmdict 1 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verb rare term astronomy waxing and waning (of the moon);phase 2 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verb rare term rising and falling (of fortune)