Proto-MSA

*ṭšḳ - to be smooth (Kogan 2015:574)

The origin is unknown. (Kogan 2015:574)

Mehri
ṭɔhēḳ - to be smooth (ML 407)
Jibbali
ṭéšəḳ - to be smooth (JL 280)
Soqotri
ṭáhaḳ - 1. to be slippery; 2. to slip (LS 200; Naumkin et al. 2014b:51, 67)