Comments:KW 59. An expressive root with numerous derivatives (bul-t-, bul-č-, bül-t- etc.); there also exist variants with -a- (bal-t-, bal-č- etc.). Most of these forms can also be found borrowed in modern Turkic and Tungus languages (see, e.g., Doerfer MT 73). Bur. > Russ. Siber. buldurun 'кочка' (Аникин 140).