‘to fire on all cylinders’: meanings and origin

1906 (of a motor vehicle): to operate with maximum power, to function at its best—1907 (of a person or thing): to perform at peak level, to be on top form—conversely, 1910: ‘to miss/misfire on all cylinders’

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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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‘mountain dew’: meanings and origin

Britain, 1747: dew of the kind that settles on mountains—Scotland, 1816: whisky or other spirit, especially when home-made or illicit (originally in reference to whisky distilled in the Highlands, i.e., in the mountainous region of Scotland)

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‘scrapbook’: meaning and origin

UK, 1817—a blank book in which pictures, newspaper cuttings, and the like are pasted for preservation—hence also (UK, 1821) used as the title of a printed book of miscellaneous contents

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