Where does “kaş” come from?

kaş (Turkish) comes from Turkish kasmak, from Proto-Turkic K(i)as- — to constrict, tighten.

kaş (Turkish): eyebrow

Definitions

Step	Language	Word	Meaning
1	Turkish	kasmak	to stretch, tight, tighten, contract, strain,...
2	Proto-Turkic	K(i)as-	to constrict, tighten

kaş — Etymology, Origin & Word History | Etymology Explorer