Comments:KW 30. Mong. has a number of similar forms with -a-: balar 'turbid', balbi- 'to become dirty, sullen', bala 'snuff', balǯira- 'be wet, soaked'. These may reflect a contamination of *bul- with another root, see *balai 'blind; dark'. The assumption of Mong. bulaŋgir being borrowed from Turkic (cf. MTurk. bulɣančaq, derived from bulɣa- 'to stir up') see in Щербак 1997, 110; on the other hand, Mong. is certainly the source of Tat. bolaŋɨr 'muddy, cloudy' etc.