USA—1966: an artificial grass surface used for sports fields—‘Astro-’: from the first use of Astroturf in the Astrodome stadium at Houston, Texas—1972, with humorous allusion to ‘grassroots’: an artificial version of a grassroots campaign
USA, 1990—a method of caring for a premature newborn in which a parent holds the infant on their chest in skin-to-skin contact—from the fact that kangaroos give birth to still-developing foetuses, then nurse them in their pouches
On the pattern of phrases such as ‘nom de guerre’, ‘nom de théâtre’ and ‘nom de plume’, ‘nom de —’ is used, often humorously, to form phrases denoting a pseudonym, an alternative name.
USA, 1971—to think creatively or in an unconventional manner—originated in a puzzle in which the aim is to connect nine dots arranged in the form of a square with four consecutive straight lines: the puzzle can be solved only by extending three of the lines outside the box implied by the arrangement of the dots
‘cross I win (and) pile you lose’ (1673)—‘heads I win (and) tails you lose’ (1728)—meaning: ‘I win whatever happens’—with reference to the practice of tossing a coin to determine a winner or to make a decision
UK, 1711—means that anyone can be right occasionally, if only by chance—often used specifically to suggest that one holding a fixed belief regardless of changing circumstances will occasionally, if rarely, be correct
USA, 1941—the person with the least amount of experience, authority and/or influence in a group or organisation—apparently coined, as ‘low man on any totem pole’, by comedian Fred Allen in a portrait of his friend, humorist H. Allen Smith
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, 1919—a person who espouses socialist ideals while enjoying a wealthy lifestyle—‘limousine’: a luxury motor car with a compartment for the passengers and a separate compartment for the driver
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