WordNet sense 1 (a playing card in the suit that has been declared trumps):

trump card

WordNet sense 2 (a brass musical instrument with a brilliant tone; has a narrow tube and a flared bell and is played by means of valves):

cornet, horn, trumpet

WordNet sense 3 (get the better of):

best, outdo, outflank, scoop

WordNet sense 4 (play a trump):

ruff

WordNet sense 5 (proclaim or announce with or as if with a fanfare):

trump out