Akkadian

sakānu - to settle down (Charpin 1994: 5–6)

A WS borrowing.

PCS
*škn - to stay, to reside (Hasselbach–Huehnergard 2007:420; Kogan 2015: 219)
The meaning “to stay” is a passive transformation of “to place,” which is probably original for *škn in PS