Reconstruction:Proto-Afroasiatic/dac-

*dac-

1. flint knife

Proto-Afroasiatic *-c- (and not *s) is reconstructed in the basis of the related *dac-, where it's attested in West Chadic and Central Chadic.

• Egyptian: ds (“flint, knife”)
• Proto-Chadic: *das- (“knife”) (see there for further descendants) (only attested in Eastern Chadic)

*dac-

1. cut, chop

Related to *dac- (“flint knife”).

• Egyptian: ds (“cut”)
• Chadic:
  • Proto-West Chadic: dac- ("cut")
    • Hausa: dāc̣a (“cut”)
  • Proto-Central Chadic: *dVc- (“chop”)
    • Lagwan: dəsə
  • Proto-East Chadic: *daHis- < *diHas- "cut", "cut hair" [metathesis of the laryngeal prefix]
    • Sokoro: dis

• Orel, Vladimir E., Stolbova, Olga V. (1995) Hamito-Semitic Etymological Dictionary: Materials for a Reconstruction (Handbuch der Orientalistik; I.18), Leiden, New York, Köln: E.J. Brill, page 140