Where does “sre” come from?

sre (Proto-Indo-European) comes from Proto-Sino-Tibetan *m/s-laj ~ s-lej — tongue.

Ancestry of “sre”, step by step

StepLanguageWordMeaning
1Proto-Sino-Tibetan*m/s-laj ~ s-lejtongue
Every word from Proto-Sino-Tibetan *m/s-laj ~ s-lej