Where does “fakkiintuminen” come from?

fakkiintuminen (Finnish) comes from Finnish fakkiintua, from Finnish fakki, from German fach, from Middle High German vach, from Old High German fah, from Proto-Germanic *fak, from Proto-Germanic faką, from Proto-Indo-European peh₂ǵ- — to attach.

Ancestry of “fakkiintuminen”, step by step

StepLanguageWordMeaning
1FinnishfakkiintuaTo overspecialize
2Finnishfakkibox, compartment; narrow field, subject
3Germanfachsecond-person singular imperative of fachen
4Middle High Germanvach-fold
5Old High Germanfahwall
6Proto-Germanic*fak
7Proto-GermanicfakąAn enclosed or defined space; division;...
8Proto-Indo-Europeanpeh₂ǵ-to attach
Every word from Proto-Indo-European peh₂ǵ-