USA, 1937—an uneasy sensation felt, especially in the stomach, as a result of nervousness or apprehension—based on the notion that the fluttering of butterflies may produce a similar sensation
UK, 1854—to belong to, or to sympathise with, two opposite groups, factions, etc.—probably a loan translation from French ‘avoir un pied dans les deux camps’ (1843)
Australia, 1973—used of anything that is absolutely unacceptable, and of any disagreeable situation or experience—‘Jap’: derogatory shortening of ‘Japanese’—Anzac Day: commemoration of the landing of the Australian and New Zealand Army Corps in the Gallipoli Peninsula in 1915
1980s—to become wildly or explosively angry; to become highly excited or enthusiastic; to intensify rapidly and especially alarmingly—refers to the failure of a guided missile’s guidance system (1966)
USA, 1953—value for money, return on an investment—originally used of military spending on nuclear weapons—‘bang’ denotes a nuclear explosion, ‘buck’ denotes a dollar
USA—1940: a policy of non-acceptance with regard to a specified situation, activity, result, substance, etc.—1971: a policy of non-acceptance with regard to abusive, anti-social or criminal behaviour, especially the use of illegal drugs
UK, 1836—a person, country, etc., that appears powerful or threatening but is actually weak or ineffective—from Chinese ‘zhǐlǎohǔ’ (‘zhǐ’, paper, ‘lǎohǔ’, tiger)—used in the post-war years by the Chinese Communist Party of the USA and other reactionaries
USA, 1889—when a situation reaches a critical point and one must commit oneself to an action or decision—the image is of having to shove when mere pushing is ineffective
Australia, 1863—originally referred to any chain of communications by which bushrangers were warned of police movements—soon extended to any rapid informal network by which information, rumour, gossip, etc., is spread