Comments:Дыбо 15. The word may be in fact identical (or derived from) *t`ŏk`V 'curved' q. v. Doerfer (TMN 2, 526) tries to dismiss the Turk.-Tung. match for reasons historical (the Manchu forms means "Chinese button" - but in fact it means "metallic button in general"), semantic ("Knopf!" - so what?) and phonetic ("das -n" - so what again? -n is a very frequent TM suffix). The obvious semantic development in TM seems to have been "buckle" > "button".