Where does “křiknúti” come from?

křiknúti (Old Czech) comes from Old Czech křik, from Proto-Slavic krȋkъ, from Proto-Indo-European (s)kreik-.

Ancestry of “křiknúti”, step by step

StepLanguageWordMeaning
1Old Czechkřik—
2Proto-Slavickrȋkъcry, scream
3Proto-Indo-European(s)kreik-—
Every word from Proto-Indo-European (s)kreik- →Every word from Proto-Slavic krȋkъ →Every word from Old Czech křik →