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
1988, Australia & USA—apathy, indifference or mental exhaustion arising from exposure to too much information—especially stress induced by the attempt to assimilate excessive amounts of information from the media, the Internet or at work
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
UK, 1827—a mood or attitude appropriate to the Christmas season, especially one involving feelings of goodwill, benevolence and a willingness to enjoy oneself
UK, 1867—a disastrous or particularly unpleasant year—Latin, literally ‘a horrible year’—coined after Latin ‘annus mirabilis’, literally ‘an extraordinary year’