Where does “ruch” come from?

ruch (Old Czech) comes from Proto-Slavic rȗxъ, from Proto-Indo-European h₃rowsos, from Proto-Indo-European h₃rews-, from Proto-Indo-European h₃er- — to move, to stir; to rise, to spring; to quarrel,...

Ancestry of “ruch”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	rȗxъ	movement
2	Proto-Indo-European	h₃rowsos	—
3	Proto-Indo-European	h₃rews-	—
4	Proto-Indo-European	h₃er-	to move, to stir; to rise, to spring; to quarrel,...

Every word from Proto-Indo-European h₃er- →Every word from Proto-Indo-European h₃rews- →Every word from Proto-Indo-European h₃rowsos →