Комментарии:EAS 53, 125, Poppe 101, Цинциус 1984, 55. A Western isogloss. Despite TMN 2, 87, Щербак 1997, 162, Mong. cannot be borrowed < Turkic; again, despite Doerfer MT 18, TM cannot be < Mong. (all because of archaic *p- preservation both in Mong. and TM). Quite enigmatic is the relationship of this root to synonymous *ŭk`urkV q. v.