The origin of the shift is probably the idiom "to hold mouth" (meaning 'to keep the fast'. Cf. Agul сивин ваз 'month of the fast' (= 'month of mouth').
The origin of the shift is probably the idiom "to hold mouth" (meaning 'to keep the fast'. Cf. Agul сивин ваз 'month of the fast' (= 'month of mouth').