O.E. dust, from P.Gmc. *dunstaz, from PIE *dheu- with a sense of "smoke, vapor" (cf. Skt. dhu- "shake," L. fumus "smoke"). The verb means both "to sprinkle with dust" (1590s) and "to rid of dust" (1560s). Sense of "to kill" is U.S. slang first recorded 1938 (cf. bite the dust under
bite).