Proto-IE: *ghogh-
Meaning: bend, curve
Tokharian: A kāts, B kātso `Bauch' ?
Armenian: gog `Höhlung, Bauschung, Schoss, Busen des Menschen; Bauch, Mutterleib etc.', gog `hohl, konkav', gogac `kólpōma', gogem `aushöhlen', ggvem `umarmen, hegen, pfletzen'
Russ. meaning: изгиб
References: WP I 570 (differently in Pok.)