USA, 1892—a hypothetical observer of human behaviour and society whose perspective would be entirely detached and objective—fictitious prose narratives told of visits either from, or to, Mars, and had for common theme that we are far behind Mars in discoveries in the material and spiritual worlds
USA, 1920: ‘wetback’: an illegal immigrant who crossed the Rio Grande from Mexico to the USA—by extension: any illegal immigrant who entered a foreign country by swimming—Mexico and USA, 1994: ‘espaldas secas’, i.e., ‘dry backs’: the U.S. citizens working in Mexico as a result of the North American Free Trade Agreement
USA, 1906: a person who advocates equality for all people at a high level of prosperity (i.e., who believes in champagne for everybody)—UK, 1956: a person who espouses socialist ideals while enjoying a wealthy lifestyle
USA, 1954—used of a theory that a political event or development in one country, etc., will lead to its occurrence in others—the image is of a falling domino causing an entire row of upended dominoes to fall
USA, 1992—to reduce staff numbers to levels so low that work can no longer be carried out effectively—portmanteau, coined by the Trends Research Institute, combining the adjective ‘dumb’, meaning ‘stupid’, and the verb ‘downsize’
USA, 1953—value for money, return on an investment—originally used of military spending on nuclear weapons—‘bang’ denotes a nuclear explosion, ‘buck’ denotes a dollar
USA, 1889—when a situation reaches a critical point and one must commit oneself to an action or decision—the image is of having to shove when mere pushing is ineffective
UK, 1824—thoroughly or perfectly right—‘trivet’: a metal tripod for a cooking pot or kettle to stand on—the phrase refers to a trivet’s always standing firm on its three feet
USA, 1857—an exclamation expressing surprise or dismay—the motivation for the choice of the female forename ‘Betsy’ (variant of ‘Betty’, pet form of ‘Elizabeth’) is unknown