‘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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‘bag of hammers’: meanings and origin

American English, 1874—used in particular of stupidity, as in ‘dumb as a bag of hammers’ and variants—the underlying notion is probably that anything is dumb that does all the hard work

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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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‘penny puzzle’ (sausage): origin and early occurrences

UK, 1882—‘penny’ refers to inexpensiveness, and ‘puzzle’ to the mysterious nature of the ingredients—perhaps also in humorous allusion to ‘penny puzzle’ in the sense of a puzzle-card sold on the street for one penny

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