Where does “piller” come from?

piller (Middle French) comes from Old French pillier, from Vulgar Latin piliare, from Latin pilāre, from Latin pila, from Latin pīlus, from Latin pīlum, from Proto-Italic pistlom, from Proto-Indo-European pis-tlo- — to grind, to crush.

piller (Middle French): to plunder; to pillage