show up as

show (someone or something) up as (something)

To reveal someone's or something's true nature, character, or properties. The books shows up the CEO as a megalomaniac only concerned with increasing his own wealth and power. The senator showed the legislation up as an attempt to enrich the nation's wealthiest citizens.
See also: show, up

show someone up as something

to reveal that someone is really something (else). The investigation showed her up as a fraud. The test showed up the candidate as unqualified.
See also: show, up