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’.
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’
UK, 1837—very weak tea—from the fact that the wife drank the first brew, and then, to make her husband’s tea, filled the pot with water, adding no fresh leaves
people who meet for a short time, by chance, and then do not see each other again—people who, although living together, are unable to see very much of each other—coined in 1873 by the U.S. poet Henry Wadsworth Longfellow