Where does “diːt” come from?

diːt (Proto-Vietic) comes from Proto-Mon-Khmer kt₁iit — posterior; to break wind.

Ancestry of “diːt”, step by step

Step	Language	Word	Meaning
1	Proto-Mon-Khmer	kt₁iit	posterior; to break wind

diːt — Etymology, Origin & Word History | Etymology Explorer