trump1 trʌmp/ noun 1. (in bridge, whist, and similar card games) a playing card of the suit chosen to rank above the others, which can win a trick where a card of a different suit has been led. "declarer ruffs the opening lead and plays a trump" verb 1. (in bridge, whist, and similar card games) play a trump on (a card of another suit). "why on earth did you trump my ace?"