It has been said that ‘(as) right as a trivet’ an alteration of ‘(as) tight as a rivet’. But the latter phrase, which postdates the former, originally meant ‘extremely tight’, not ‘thoroughly or perfectly right’.
mania for holding public office—USA, 1829—a borrowing from Spanish ‘empleomanía’, from ‘empleo’ (i.e., ‘employment’) and the suffix ‘‑manía’ (i.e., ‘-mania’)
1974: a person who tries to fit into a particular cultural scene—1970: an actor who performs a minor role in a stage play—from ‘scene’ and the suffix ‘‑ster’, forming agent nouns
USA, 1969—the action or process of becoming or being made plain, ordinary, uninteresting or insipid—from the adjective ‘bland’ and the suffix ‘‑ification’, forming nouns of action
UK, derogatory—a male van driver, often of a white van, whose driving is selfish and aggressive—1997, in a report issued by the Freight Transport Association