Comments:EDT 799, VEWT 421, ЭСТЯ 7, Stachowski 130. Only Yak. and Chuv. reflect the original *sīk; all other languages reflect a derivative *sīg-t- / *sīg-d- (present also outside Turkic) > *sīd-. Also widely reflected is the secondary derivative *sīd-dik 'urine' ( > Turkm. sīdik etc., see ЭСТЯ 7).
Comments: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.