OED2

• First, the relevant meanings for show up in OED2: transitive: ‘to disgrace or discredit by a thorough exposure; to exhibit as an impostor or an imposture; to expose (a person’s faults, ignorance, misdeeeds, etc.)’ intransitive (marked as colloquial): ‘to put in an appearance; to be present or ‘turn up’ (at an appointed time or place)’ Now, the usage facts about the past participle of show.

Definitions (0)