Hebrew

pšṭ - to strip off, to put off one's garment; to make a dash (from a sheltered place) (HALOT 980)

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).