From Proto-Turkic *tüĺ-. Compare to Turkish düşmek.
тӱжер • (tüžer)
N. A. Baskakov, Toščakova N.A, editor (1947), “тӱжер”, in Ojrotsko-Russkij Slovarʹ [Oyrot-Russian Dictionary], Moscow: M.: OGIZ, →ISBN