‘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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‘hobnail express’: meaning and origin

USA, 1882—one’s boots or feet as a means of travel, humorously represented as a form of public transport—refers to boots with hobnails inserted into the soles

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