Syriac

ṣwb - congregatus est; advenit, visitavit (to come, to arrive, to visit) (LSyr. 623)

PWS
*ṣwb - to be fitting (SEDonline)

One wonders whether PWS *wṣb/*nṣb ‘to stand, to be erect; to be firm, stable’ may be further related as variant roots.