‘mark twain’: meaning and origin

1809—U.S. nautical, obsolete: the two-fathom mark on a sounding-line—Samuel Langhorne Clemens chose it as his pen-name in 1863, but a pilot named Isaiah Sellers had first used it as his pen-name

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‘to drive the porcelain bus’: meaning and origin

to vomit from drunkenness—U.S. students’ slang, 1980—likens the position of the hands of a person holding onto the sides of a toilet bowl while vomiting therein, to that of a bus driver’s hands holding the steering wheel

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‘technosaur’: meaning and origin

a person who shows no proficiency in the use of information technology—USA, 1998—from ‘techno-’ in ‘technological’ and ‘technology’, and ‘-saur’ in ‘dinosaur’, i.e., a person who is unable to adapt to change

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‘flash mob’: meaning and origin

USA, 2003—a group of people organised by means of the internet, mobile phones or other wireless devices, who assemble in public to perform a prearranged action together and then quickly disperse

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‘ball and chain’ (literal and figurative uses)

USA 1813—a heavy metal ball secured by a chain to a person’s leg to prevent escape or as a punishment—figuratively, mid-19th century: anything seen as a heavy restraint, especially the matrimonial bonds

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‘Gallic shrug’: meaning and origin

a gesture (made by a French person to deny responsibility, knowledge or agreement) consisting typically in shrugging one’s shoulders while upturning one’s hands

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‘Potemkin village’: meaning and origin

an impressive facade or show designed to hide an embarrassing or shabby fact or condition—1843—from the sham villages said to have been built by Grigori Potemkin to deceive Catherine II

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