‘(as) extinct as the diplodocus’: meaning and origin

of a person or thing: irretrievably defunct or out of date—UK, 1905—perhaps originally in allusion to ‘Diplodocus Carnegii’, named after Andrew Carnegie, who, that year, presented the skeleton of that diplodocus to the Natural History Museum of London

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‘sitting duck’: meaning and origin

an easy target, i.e., a person who, or thing that, is defenceless against an attack or other danger—first used in 1936 & 1937 by the Canadian journalist Gordon Sinclair

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‘to live on one’s hump’: meaning and origin

late 19th century—to be self-sufficient, to operate from resources accumulated earlier—refers to the ability of a camel to survive for long periods without food or water by drawing on the store of nourishment contained in its hump

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‘goldfish’ (as used of intelligence and of memory)

USA 1920: ‘to have the brains of a goldfish’ (to have limited intelligence)—USA, 1958: ‘to have the memory of a goldfish’ (to be unable to retain information or memories for any significant length of time)

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