Akkadian

ṣibūtu - need, want, request; purpose; business activity, enterprise (CAD Ṣ 167)

It comes so close to Aramaic ṣəbūtā both formally and semantically that an Akkadism (or at least some kind of Akkadian influence) is to be seriously considered (see Kogan 2015:427).

PS
*ṣbw - to wish, to desire (Kogan 2015:95)

It similarly mirrors the semantic evolution of the PWS root *ptw ‘to desire’ (> Arb. fataⁿ ‘youth’).