Where does “*čistì” come from?

*čistì (Proto-Slavic) comes from Proto-Balto-Slavic (s)keistéi, from Proto-Indo-European *(s)kʷéyt-t ~ *(s)kit-ént, from Proto-Indo-European kʷeyt- — to notice; to read.

Ancestry of “*čistì”, step by step

Step	Language	Word	Meaning
1	Proto-Balto-Slavic	(s)keistéi	—
2	Proto-Indo-European	(s)kʷéyt-t ~ (s)kit-ént	—
3	Proto-Indo-European	kʷeyt-	to notice; to read

Every word from Proto-Indo-European kʷeyt- →

*čistì — Etymology, Origin & Word History | Etymology Explorer