Where does “kustīgums” come from?

kustīgums (Latvian) comes from Latvian kustīgs, from Latvian kustēt, from Latvian kusēt, from Old Turkic kus-, from Proto-Indo-European ḱewk- — flare up, glow; white; to glow, burn, lighten.

kustīgums (Latvian): mobility, activity, agility

Definitions

mobility, activity, agility

Ancestry of “kustīgums”, step by step

Step	Language	Word	Meaning
1	Latvian	kustīgs	mobile, moving, active; moving
2	Latvian	kustēt	to move
3	Latvian	kusēt	—
4	Old Turkic	kus-	—
5	Proto-Indo-European	ḱewk-	flare up, glow; white; to glow, burn, lighten

Every word from Proto-Indo-European ḱewk- →Every word from Old Turkic kus- →Every word from Latvian kusēt →