1580s, "song for two voices, duet," via either Italian or French from Latin duo "two" (from PIE root *dwo- "two"). Meaning "two people" (especially as an entertainment team) attested by 1887.
dunghill
dunk
Dunker
Dunkirk
dunno
duo
duodecimal
duodecimo
duodenal
duodenary
duodenum
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