trump"fabricate, devise," 1695, from trump "deceive, cheat" (1513), from M.E. trumpen (late 14c.), from O.Fr. tromper "deceive," of uncertain origin, perhaps from a verb meaning "to blow a trumpet." Trumped up "false, concocted" first recorded 1728.
trump"trumpet," c.1300, from O.Fr. trompe "long, tube-like musical wind instrument" (12c.), cognate with Prov. tromba, It. tromba, all probably from a Gmc. source (cf. O.H.G. trumpa and O.N. trumba "trumpet"), of imitative origin.