Proto-Sino-Tibetan: *thuaŋ ( ~ dh-)
Meaning: empty, hole
Tibetan: doŋ a deep hole, pit, ditch, stoŋ empty, clear, hollow, stoŋs to make empty.
Burmese: twaŋh hole in the ground, pit, thwaŋh to make a hole.
Comments: Rawang duŋ-; Trung duŋ1 cave. Sh. 51; Ben. 45. Perhaps here Chepang hmo-toŋ, Anong ma.55 doŋ.31 'mouth'.