Proto-Altaic: *tū́p`e ( ~ *ti̯ūp`i, *č-)
Meaning: bottom
Russian meaning: дно
Comments: A Turk.-Mong. isogloss. The relationship to TM *dō- 'to sit down (of birds)', suggested in ТМС 1, 211, is unclear; if it exists, we may be dealing here with an archaic case of *-p`-suffixation.