Mandaic

pšṭ - to stretch out, to extend; to separate, to tear apart or away, to injure, to wound (MD 382)

PNWS

*pšṭ - to spread, to stretch; to strip off, to separate (EDA I)

May be related to Arb. bsṭ ‘to spread, to expand with an irregular mutation of labials in Arb. (Kogan 2015:477).