various meanings, in particular: something with a larger capacity than its outward appearance suggests—UK, 1968—the name, in TV series Doctor Who, of a time machine outwardly resembling a police telephone box, yet inwardly much larger
a synthesizer designed to be held in the manner of a guitar, with one hand playing a keyboard while the other operates controls on an extended handle—USA, 1979—from ‘key-’ in ‘keyboard’ and ‘-tar’ in ‘guitar’
a factor speculatively included in a hypothesis or calculation, especially to account for some unquantified but significant phenomenon or to ensure a desired result—USA, 1947
USA—(1957) of computer data: incorrect or poor-quality input will produce faulty output—also applied (1964) to processes likened to computerised data processing
a vehicle which travels on a cushion of air—UK, 1958, apparently coined by engineer Christopher Sydney Cockerell—also, USA, 1958, in the sense of “a flying car”
from the image of a speeding explosive projectile—primary meaning (of a motorcar, an aircraft, a motorcycle, an animal, a person): to move very fast—later (also ‘to go down like a bomb’ and ‘to go down a bomb’): to be very successful or popular
to invest one with energy—USA, 1959 & 1960—used as an advertising slogan by both Oklahoma Oil Company and Humble Oil & Refining Company—this advertising slogan soon became a popular catchphrase
UK, 1989—the practice of sending food destined for the British market for irradiation in a country, typically the Netherlands, where this process is permitted, in order to mask any bacterial contamination before it is put on sale—from ‘Dutch’ and the suffix ‘-ing’, forming nouns denoting an action
Japan 1990s—the extreme avoidance of social contact, especially by adolescent males; a person, typically an adolescent male, who avoids social contact—Japanese ‘hikikomori’ is the nominalised stem of the verb ‘hikikomoru’, meaning ‘to withdraw into seclusion’
Australia—1954: a very unpleasant experience—originally, 1953: a particularly rough stretch of road on the 6,500-mile round-Australia Redex Reliability Trial of August-September 1953—hence, 1953: any particularly rough stretch of road