From Longman Dictionary of Contemporary Englishtrump something ↔ up phrasal verbSCTRICK/DECEIVEto use falseinformation to make someone seem guilty of doing something wrongThey had trumped the whole thing up to get rid of him. —trumped-up adjectiveDissidents were routinely arrested on trumped-up charges. →trump→ See Verb table
Examples from the Corpus
trump up• That you have trumped this up.• And perhaps it was time to play the trump card up his sleeve.