Definition from Wiktionary, the free dictionary
- (idiomatic) to create falsely, to fabricate (particularly applied to accusations, (legal) charges or evidence).
- His electoral "campaign" to date has included attempts to trump up criminal charges against his opponents.
- (idiomatic) Heavily publicise, promote or market a product.
- We don't often trump up products purely for the virtue of being "new".
to create falsely, to fabricate
to heavily publicise, promote or market a product