Comments:EAS 97, KW 174. Despite Doerfer MT 57 the TM forms are very hard to explain as borrowed from Mong. In Jpn. the word is usually analysed as "mouth ring", which seems to be a folk etymology (in view of external parallels: together with Kor. kùr'ǝ́i it presupposes a suffixed form like *kádu-bV-). It seems that we in fact are dealing here with an archaic term of horse harness.
