The Proto-Kartvelian word c̣ow-
Word c̣ow-
Meaning to suck

Comments
Heinz Fähnrich, Surab Sardshweladse: Etymologisches Woerterbuch der Kartwel-Sprachen, 1995 Brill

Other words that might be of interest
č̣am ‘to eat’, gab ‘to cook, boil’, s₁w- ‘to drink’, s₁Ʒ1e- ‘milk’, twer- ‘to drink’, xwleṗ- ‘to drink’, *ɣwino- ‘wine’