‘(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of a person or thing: irretrievably defunct or out of date—UK, 1905—perhaps originally in allusion to ‘Diplodocus Carnegii’, named after Andrew Carnegie, who, that year, presented the skeleton of that diplodocus to the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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‘Charlie (Big) Potatoes’: meaning and origin

a rich and important man—USA, 1958, as ‘Charlie Potatoes’—UK, 1995, as ‘Charlie Big Potatoes’— ‘Charlie’: generic term for a man—‘potatoes’: perhaps slang for ‘money’, ‘dollars’

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‘scumbag’: meanings and origin

USA, 1953: a base, despicable person—from ‘scumbag’ in the sense of ‘a condom’ (here, the noun ‘scum’ is slang for ‘semen’)

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‘zip-lipped’: meanings and origin

having the lips tightly closed—hence, figuratively: uncommunicative, determinedly reticent—USA, 1942—refers to the noun ‘zip’, designating a fastening device

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‘to get off one’s bike’: meaning and origin

to get excited, annoyed, angry—Australia, 1923—maybe based on the image of a person who, while riding a bicycle, gets provoked by another person: the cyclist would then dismount and respond to the provocator

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‘hair-triggered’: meanings and origin

literally (UK, 1803): of a firearm: equipped with a hair trigger—hence, figuratively (Ireland, 1853): reacting immediately to the slightest provocation or cause

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