PS

*ˁarŝ- - bed (Steiner 1977:130‒136; Kogan 2015:387)

Akkadian
eršu - bed (CAD E 315)
Jewish Babylonian Aramaic
ˁarslā - hammock (DJBA 165; Steiner 1977:130‒136)
Argobba
arš - bed, throne, loft (AAD 269)
Harari
arši - throne (EDH 32)