Where does “emprunter” come from?

emprunter (Old French) comes from Vulgar Latin *imprūmūtāre, from Latin imprōmūtuāre, from Latin prōmūtuārī.

Ancestry of “emprunter”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	*imprūmūtāre	—
2	Latin	imprōmūtuāre	—
3	Latin	prōmūtuārī	—

emprunter — Etymology, Origin & Word History | Etymology Explorer