Where does “schūren” come from?

schūren (Middle High German) comes from Old French escurer, from Medieval Latin scuro, from Latin cūrō, from Latin cūra, from Proto-Indo-European kʷeys-, from Proto-Indo-European kʷey- — to pay; to avenge.

Ancestry of “schūren”, step by step

Step	Language	Word	Meaning
1	Old French	escurer	—
2	Medieval Latin	scuro	—
3	Latin	cūrō	to arrange, see to, attend to, take care of, look after, ensure, tend to
4	Latin	cūra	care, concern, thought
5	Proto-Indo-European	kʷeys-	to see; to heed
6	Proto-Indo-European	kʷey-	to pay; to avenge

Every word from Proto-Indo-European kʷey- →Every word from Proto-Indo-European kʷeys- →Every word from Latin cūra →