Is it ensure, insure, or assure?
early 12c., "sovereign prince," from Old French duc (12c.) and directly from Latin dux (genitive ducis) "leader, commander," in Late Latin "governor of a province," from ducere "to lead," from PIE *deuk- "to lead" (cf. Old English togian "to pull, drag," Old High German ziohan "to pull," Old English togian "to draw, drag," Middle Welsh dygaf "I draw").
Applied in English to "nobleman of the highest rank" probably first mid-14c., ousting native earl. Also used to translate various European titles (e.g. Russian knyaz).
: More than 90 percent of the fugitives don't want to duke it out (1960s+)
[perhaps fr Romany dook, ''the hand as read in palmistry, one's fate'']
derived from the Latin dux, meaning "a leader;" Arabic, "a sheik." This word is used to denote the phylarch or chief of a tribe (Gen. 36:15-43; Ex. 15:15; 1 Chr. 1:51-54).