Ugaritic

sˀin - edge, hem (DUL 751, Watson 2007: 103)

Moran 1983: perhaps an old loanword from Akk. before the loss in the latter of the aleph, or perhaps both going back to a common source and the textile vocabulary of the third millennium B.C.? see also Akk sūnu

Areal reconstruction
*sˀin - edge, hem (Kogan 2015:341)