Ichidan verb, Transitive verb
to fabricate; to invent; to make up (a story); to cook up; to trump up (a charge); to concoct
実際彼には嘘をでっち上げる癖がある。The truth is he has a habit of inventing lies. to cobble together; to put together (in a slapdash manner)
Also written 捏ち上げる【でっちあげる】