PWS

*ply - to delouse (SED II No. 175; Kogan 2011: 213)

PS
*pVl(y)- - kind of insect, louse (SED No. 175)
Clearly related is the verbal root *ply ‘to delouse’ widely attested throughout Semitic. Cf. Tna. ˁafäl ‘insects or fleas which live in grass’ (TED 1949). One wonders whether it could be directly compared to Akk. uplu (< *ˁupl-)?

Jewish Palestinian Aramaic
ply - to remove lice (DJPA 436)
Syriac
ply - to collect; (pa.) to delouse (LSyr. 569, SL 1199)
Arabic
fly - look for lice (BK 2 635)
Amharic
fälla - to pullulate, swarm (insects, ants) (AED 2260)
Attested in particular in the expression ḳəmal fälabät ‘to be swarming with lice’ (according to Kane, a secondary semantic development from the main meaning of fälla, namely ‘to boil, to ferment’)
Mehri
fəlō - to delouse (ML 95)
Jibbali
félé - to delouse (JL 58)
Harsusi
felō - to delouse (HL 33)
Soqotri
fέḷe - to delouse (CSOL I 535)