Where does “krūfan” come from?

krūfan (Old High German) comes from Proto-Germanic kreupaną, from Proto-Indo-European ger- — to turn, bend, twist, wind; to tie, bind...

Ancestry of “krūfan”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	kreupaną	to twist, to creep
2	Proto-Indo-European	ger-	to turn, bend, twist, wind; to tie, bind...