real events and situations are often more remarkable or incredible than those made up in fiction—first occurred as ‘truth is always strange, stranger than fiction’ in Don Juan (1823), by George Gordon Byron
to use a lot of swearwords—first used in 1713 by Joseph Addison—alludes to the fact that troopers (i.e., soldiers of low rank in the cavalry) had a reputation for coarse language and behaviour
1750—the non-academic inhabitants (‘town’) of a university city and the resident members of the university (‘gown’, denoting the distinctive costume of a member of a university)
alludes to the belief that such a hat or cap protects the wearer from mind control, surveillance or similar types of threat—USA, 1972 as ‘tinfoil-lined hat’
a person or thing that is insignificant or contemptible—1910—originally (1900): a type of small high-velocity shell, with reference to the high-pitched sound of its discharge and flight
in French contexts: a young person, especially a young man, belonging to a youth subculture of the 1950s and 1960s—UK, 1959—from the noun ‘blouson’ (a short jacket) and the adjective ‘noir’ (black)
to abandon or betray someone in order to protect or advance one’s own interests—originally (British politics, 1971) ‘to push someone under a bus’—derived from ‘to walk under a bus’ (British politics, 1966)
scarce; infrequent; difficult to find or to come by—one early use in 1668—but popularised by the Irish author Thomas Campbell in The Pleasures of Hope (1799)