Комментарии:VEWT 283, EDT 670, Лексика 491-492, Федотов 2, 375-376, ЭСТЯ 6, 90-94. Turk. > WMong. qos, Kalm. xoš (KW 189), WMong. qosi-liɣ (Clark 1980, 42). The root is confused with *Koĺ 'pair', but should be probably distinguished. Tat. and Bashk. obviously reflect a contamination with *Koguĺ 'empty space, hollow'. A loanword from Tokh. koṣkīye 'hut' (which itself is < Iranian, see Adams) had been suggested - which, however, cannot explain the absence of -k- in the Turkic form.