Where does “kouř” come from?

kouř (Czech) comes from Czech kouřit, from Old Czech kúřiti, from Proto-Slavic kuriti — to smoke.

kouř (Czech): smoke

Definitions

Step	Language	Word	Meaning
1	Czech	kouřit	to smoke
2	Old Czech	kúřiti	—
3	Proto-Slavic	kuriti	to smoke

kouř — Etymology, Origin & Word History | Etymology Explorer