Where does “kyū-” come from?

kyū- (Proto-Balto-Slavic) comes from Proto-Indo-European kew- — to swell; skin, complexion; to bend, to be bent.

Ancestry of “kyū-”, step by step

kyū- traces back through two separate lines of ancestry.

via Proto-Indo-European kew-

StepLanguageWordMeaning
1Proto-Indo-Europeankew-to swell; skin, complexion; to bend, to be bent

via Proto-Indo-European kū-

StepLanguageWordMeaning
1Proto-Indo-Europeankū-to cry, to call; to howl, to shout; cf....
Every word from Proto-Indo-European kew-
kyū- — Etymology, Origin & Word History | Etymology Explorer