Where does “рюти” come from?

рюти (Old East Slavic) comes from Proto-Slavic řuti, from Proto-Indo-European rew- — to roar, growl, grumble; to roar; growl; grumble;...

Ancestry of “рюти”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	řuti	to roar
2	Proto-Indo-European	rew-	to roar, growl, grumble; to roar; growl; grumble;...