Also found in: Dictionary, Thesaurus.
Related to jumped-up: jumped ship
slang Glorified. The phrase is used to describe someone who acts or is thought to be more important or powerful than they really are. Primarily heard in UK. I can't believe she's trying to tell me what to do, when she's just a jumped-up intern! These days, it feels like the prime minister is nothing more than a jumped-up headmaster.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.