Where does “kupać” come from?

kupać (Polish) comes from Old Polish kupać, from Old Polish kupić, from Proto-Slavic kupiti, from Proto-Germanic kaupōną, from Proto-Germanic kaupô, from Latin caupo, from Proto-Indo-European kaup-.

Ancestry of “kupać”, step by step

StepLanguageWordMeaning
1Old Polishkupaćto buy
2Old Polishkupićto buy
3Proto-Slavickupitito pile, to gather in one place; to buy, to trade
4Proto-Germanickaupōnąto buy; trade
5Proto-Germanickaupôinnkeeper; merchant
6LatincaupoTradesman; Innkeeper, shopkeeper
7Proto-Indo-Europeankaup-—
Every word from Proto-Indo-European kaup- →Every word from Latin caupo →Every word from Proto-Germanic kaupô →