Where does “-vyknout” come from?

-vyknout (Czech) comes from Old Czech -vyknúti, from Proto-Slavic vyknǫti, from Proto-Slavic yknǫti, from Proto-Balto-Slavic uk-, from Proto-Indo-European h₁uk-néw-ti, from Proto-Indo-European h₁ewk- — to be accustomed; to become accustomed; be...

Ancestry of “-vyknout”, step by step

Step	Language	Word	Meaning
1	Old Czech	-vyknúti	—
2	Proto-Slavic	vyknǫti	to acclimate, to habituate; to shout out
3	Proto-Slavic	yknǫti	—
4	Proto-Balto-Slavic	uk-	—
5	Proto-Indo-European	h₁uk-néw-ti	—
6	Proto-Indo-European	h₁ewk-	to be accustomed; to become accustomed; be...

Every word from Proto-Indo-European h₁ewk- →Every word from Proto-Indo-European h₁uk-néw-ti →Every word from Proto-Balto-Slavic uk- →