UK, 1822—of a member of parliament: to join the party opposed to one’s present party—also to vote against one’s own party; to change sides on an issue—from the practice whereby a member of parliament literally crosses the floor to join another party
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
1909 to 1923 in stories by English author P. G. Wodehouse—a facetious appellation for a home or hospital for people with mental illnesses—‘loony’: shortened form of ‘lunatic’
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
UK, 1808—to make one’s beliefs or intentions plain—from the former practice of nailing an ensign to the mast of a ship, after damage during battle resulted in the ship’s colours no longer being clearly displayed, which otherwise might have been interpreted as a signal of surrender
UK, 2005—the perceived indiscriminate and excessive use by the authorities of anti-social behaviour orders—apparently coined by Álvaro Gil-Robles, the Council of Europe’s Commissioner for Human Rights—‘Asbo’: acronym from the initial letters of ‘anti-social behaviour order’
USA, 1775—to do or say something remarkable or startling—the precise underlying notion in the choice of ‘Dutch’ is not clear—‘Dutch’ occurs in a number of derogatory or derisive English phrases
Australia—familiar name of St Vincent’s Private Hospital, Sydney—‘Jesus’ refers to the fact that the hospital is operated by a religious organisation—‘Hilton’ alludes to the hospital’s plushness
Australia, 1966—typically Australian in character—alteration of the phrase ‘as American as apple pie’, with reference to the prominence of meat pie in Australian diet
Australia, 1982—a stretch of Oxford Street, in Sydney, which is the city’s main gay district—refers to the use of Vaseline to ease anal intercourse, and based on the alliteration in /v/