Комментарии:KW 355, Владимирцов 198, Poppe 31, 62, АПиПЯЯ 17, Мудрак Дисс. 40-41, 44. Irregular voicing in Mong. can be explained by the root's expressive nature. Cf. also Mong. siǯiŋ 'a person urinating in his bed' - probably reflecting the derivative *šī́gdi < *šī́k`di, attested also in Turkic, TM, Korean and Japanese.