'To trump up' definitions:

Definition of 'To trump up'

From: GCIDE
  • Trump \Trump\, v. t. [F. tromper to deceive, in OF., to blow a trumpet, se tromper de to mock. See Trump a trumpet.]
  • 1. To trick, or impose on; to deceive. [Obs.] "To trick or trump mankind." --B. Jonson. [1913 Webster]
  • 2. To impose unfairly; to palm off. [1913 Webster]
  • Authors have been trumped upon us. --C. Leslie. [1913 Webster]
  • To trump up, to devise; to collect with unfairness; to fabricate; as, to trump up a charge. [1913 Webster]