Where does “прати” come from?

прати (Serbo-Croatian) comes from Proto-Slavic pьrati — to fly; to beat, to trample; to wash.

Ancestry of “прати”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	pьrati	to fly; to beat, to trample; to wash

прати — Etymology, Origin & Word History | Etymology Explorer