Most likely borrowed from Semitic, possibly from Phoenician. Compare Hebrew שַׂק, Imperial Aramaic 𐡔𐡒 (šq), Talmudic Aramaic סַקָּא, Classical Syriac ܣܩܐ, Ge'ez ሠቅ (śäḳ), Akkadian 𒆭𒊓 (/šaqqu/), Egyptian sꜣgꜣ. The word is a widely-borrowed Mediterranean Kulturwort.
Černý and Forbes suggest the word was originally Egyptian, a nominal derivative of sꜣq (“to gather or put together”) that also yielded Coptic ⲥⲟⲕ (sok, “sackcloth”) and was borrowed into Greek perhaps by way of a Semitic intermediary. However, Vycichl and Hoch reject this idea, noting that such an originally Egyptian word would be expected to yield Hebrew *סַק rather than שַׂק. Instead, they posit that the Coptic and Greek words are both borrowed from Semitic, with the Coptic word perhaps developing via Egyptian sꜣgꜣ.
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- Forbes, Robert Jacobus (1955) Studies in Ancient Technology, vol. IV, p. 66
- Černý, Jaroslav (1976) Coptic Etymological Dictionary, Cambridge: Cambridge University Press, →ISBN, page 149
- Vycichl, Werner (1983) Dictionnaire Étymologique de la Langue Copte, Leuven: Peeters, →ISBN, page 186
- Hoch, James E. (1994) Semitic Words in Egyptian Texts of the New Kingdom and Third Intermediate Period, Princeton: Princeton University Press, →ISBN, page 269
- σάκκος in Liddell & Scott (1940) A Greek–English Lexicon, Oxford: Clarendon Press
- G4526 in Strong, James (1979) Strong’s Exhaustive Concordance to the Bible
- Woodhouse, S. C. (1910) English–Greek Dictionary: A Vocabulary of the Attic Language, London: Routledge & Kegan Paul Limited.