Syriac

nwp - se inclinavit; pependit (to bow (intr.); to hang) (LSyr. 421)

PWS
*nwp - to swing (Kogan 2015:566)

The meaning of Akk. nâpu, translated as ‘schwanken’ in AHw. 742, is highly uncertain (cf. CAD N₁ 327) which makes its comparison rather problematic (Kogan 2015:566).