The meaning ‘swallow’ is conjectural since the word is attested only as a divine designation in 1.17 II 27 and parallel passages: ˁrb bbth kṯrt // bnt hll snnt kṯrt ‘entered his house // daughters of the light, swallows’
quite uncertain (cf. Pardee 2002a: 95), but even if accepted, Akk. siparru ‘bronze’ is an old Wanderwort so that an Akkadism in Ugaritic is hard to prove
Ugaritic
ss̀t - baseboard, floor of a chariot
(DUL 772, Watson 2007: 106)
uncertain, borrowing from Akk. sassu (CAD S 195) or any of the alternative Akkadian parallels mentioned by Watson is unprovable
Var. s̀s̀w. Cf. sswt ‘mare’. Of uncertain origin (cf. SED II No. 199), but, contra Watson 2007: 70, certainly not an Akkadism in Ugaritic (Kogan 2015: 359).