vanquish Look up vanquish at Dictionary.com
early 14c., from O.Fr. venquis (past tense), and vencus (p.p.), from veintre "defeat," from L. vincere "defeat" (see victor). Influenced in M.E. by M.Fr. vainquiss-, present stem of vainquir "conquer," from O.Fr. vainkir, alteration of veintre.