UK, 1992—coined by Alan Clark during the Matrix Churchill trial—variant of ‘to be economical with the truth’, meaning: to deceive people by deliberately not telling them the whole truth about something
to be utterly defeated—alludes to the defeat of Napoléon I at the Battle of Waterloo in 1815—UK, 1832, as ‘to meet with a Waterloo’—USA, 1838, as ‘to meet one’s Waterloo’
UK, 1894—a love-relationship in which one member of a married couple is involved with a third party—loan translation from French ‘triangle éternel’, coined by Alexandre Dumas fils in L’Homme-Femme (1872), a pamphlet about a wronged husband’s right to take the life of his adulterous wife
UK, 1942—a weekly hour of religious instruction provided by chaplains to British-Army units—‘padre’ (literally ‘father’) is colloquially used to designate and address a male chaplain in the armed forces
UK, 1922—used in negative constructions with a following noun to mean ‘a single ——’, ‘any ——’; the nouns most commonly used in those constructions are ‘notice’ and ‘difference’
a profession which has long been established or which is regarded as having similarities with prostitution—also sometimes used jocularly—alludes to ‘the oldest profession in the world’ (i.e., prostitution)
a man’s habit of sexual promiscuity or infidelity—refers to the zipper on the flies of a pair of trousers—USA, 1982, originally used of Members of Congress in Washington, D.C., and recorded by gossip columnist Diana McLellan
UK, 1803, as an adjective—UK, 1842, as a noun—in reference to the action or practice of attacking, or acting against, someone in a treacherous or underhand manner
Ireland, 1914—the action or practice of attacking, or acting against, someone in a candid or open manner, as opposed to deceptively or duplicitously—coined after ‘backstabbing’ (i.e., the action or practice of attacking, or acting against, someone in a treacherous or underhand manner)