From sharar; a string (as twisted (compare shariyr)), i.e. (specifically) the umbilical cord (also figuratively, as the centre of strength) -- navel.
see HEBREW sharar
see HEBREW shariyr
H8270. shor
[שֹׁר] noun [masculine] navel-string (compare Aramaic שׁוּרָא Ezekiel 16:4 ᵑ7, , Arabic , all id.); — suffix שָׁרֵּךְ כָרַּת לאֹ 16:4 (Ges§ 22s Köii. 1. 45) thy navel-string was nut cut; questioned are: שָׁרֶּ֑ךָ Proverbs 3:8 (De and others navel, synechd. for body, "" עַצְמוֺתֶתךָ; ᵐ5 τῷ σώματι; σου, compare ᵑ6, Clericus Bi Frankenb בְּשָֽׂרְךָ, Ew Hi Kmp and others שְׁאֵרְךָ, Toy either); שָׂרְרֵךְ Cant 7:3 (ᵐ5 ὀμφαλάς σοὺ "" בִּטְנֵךְ), = שָׁרֵּךְ Thes and others; now often interpreted as = vulva, compare Arabic secret part, Hi Stickel Buhl Öttli, noticed also by Thes, but Arabism dubious, see Bu.