UK, early 19th century—private property taken from an enemy in war—originally an Anglo-Indian noun, from Hindi ‘lūṭ’, from Sanskrit ‘luṇṭh-‘, ‘to rob’—came to be also used as slang for ‘money’ and to also denote ‘wedding presents’
British English, first recorded, apparently as army slang, in 1945—probably from ‘bonk’ (= a blow on the head) and the suffix ‘-ers’ as in ‘ravers’ (from ‘raving mad’) and ‘starkers’ (from ‘stark mad’)
The phrase ‘boys in the backroom’, or ‘backroom boys’, appeared in the 1920s as a U.S. political term denoting persons exercising a surreptitious influence. The Oxford English Dictionary is therefore mistaken in saying that it originally denoted, in 1941, persons engaged in research.
‘Backward in coming forward’ means ‘reluctant, shy to do something’. The earliest instances that I have found are about funds set up in order to provide aid to soldiers wounded during the Napoleonic Wars.
During the Cold War, especially in the context of a possible nuclear war, ‘better red than dead’ was used to warn against uncompromising opposition to communism, while ‘better dead than red’ was used to express unconditional opposition to communism.
from army use on the Western Front during World War One: ‘cootie’, ‘body louse’, ‘cooty’, ‘infested with lice’, ‘coot’, ‘louse’, probably ultimately refer to the aquatic bird called ‘coot’, reputed to be lice-infested
some characteristic slang creations of the British, U.S. and French soldiers during World War One, as recorded in ‘Trench Talk’, published in Everybody’s Magazine (New York) of January 1918
early 20th century—‘Zeppelins in a cloud’ and variants mean ‘sausage and mash’—during World War One, the phrase was used as a manner of disregarding the fear caused by the bombing raids carried out by Zeppelin airships
An expression of indifference to, or resigned acceptance of, a state of affairs, ‘san fairy ann’ jocularly represents the French phrase ‘ça ne fait rien’, meaning ‘that doesn’t matter’. It originated in army use on the Western Front during the First World War.
Greek ‘δορυϕόρος’ (‘doruphόros’) meant ‘spearman’; in French, ‘doryphore’ denotes the Colorado beetle and the German occupying forces during WWII; in English, it denotes a pedantic and annoyingly persistent critic.