1. To get the better of an adversary or competitor in a contest by using a crucial, or often a hidden resource: The bid or offer for the car was trumped by the man with a higher bid.
2. To produce a sound as if it were coming from a trumpet: In the evening, the bugler trumped, using the public address system, so all of those in the camp knew that they were expected to return to their tents.
3. To be more important than something else: The need for a good education trumps over being uneducated and unprepared for a vocation or a job.
4. To beat another playing card by playing one from the suit that beats the others: Lorna trumped her ace to win the game.

To create or to make up something false in order to cause problems for another person: The supervisor trumped up an unverifiable reason for firing Roxanne.