Where does “*C-sat” come from?

*C-sat (Proto-Lolo-Burmese) comes from Proto-Sino-Tibetan *g/b-sat.

Ancestry of “*C-sat”, step by step

Step	Language	Word	Meaning
1	Proto-Sino-Tibetan	*g/b-sat	—

*C-sat — Etymology, Origin & Word History | Etymology Explorer