‘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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‘sparrowfart’: meanings and origin

British, dialectal, 1828: the break of day, i.e., the dawn chorus, with humorous allusion to a small passerine breaking wind—later also: an insignificant person or thing

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‘stupid o’clock’: meaning and origin

UK, late 1980s—the adverb ‘o’clock’ is colloquially and humorously used with adjectives to denote an unreasonably, excessively or inconveniently early or late hour—as in ‘stupid o’clock’, ‘silly o’clock’, etc.

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