Where does “*tamčï” come from?

*tamčï (Undetermined) comes from Proto-Turkic Tạm-, from Proto-Indo-European ten- — to stretch, to extend.

Ancestry of “*tamčï”, step by step

Step	Language	Word	Meaning
1	Proto-Turkic	Tạm-	to burn; to kindle; to become excited
2	Proto-Indo-European	ten-	to stretch, to extend