Where does “grzmieć” come from?

grzmieć (Polish) comes from Proto-Slavic *grьmě̀ti, from Proto-Balto-Slavic grimēˀtei, from Proto-Indo-European gʰr̥meh₁-.

grzmieć (Polish): to thunder, to roar

Definitions

Step	Language	Word	Meaning
1	Proto-Slavic	*grьmě̀ti	—
2	Proto-Balto-Slavic	grimēˀtei	—
3	Proto-Indo-European	gʰr̥meh₁-	—

grzmieć — Etymology, Origin & Word History | Etymology Explorer