high-mileage

The compound 'high-mileage' is a modern formation built from two established English words. 'High' descends from the Old English concept of physical and metaphorical loftiness, here used to signify a large quantity. 'Mileage' is derived from the Latin 'milia', meaning 'thousands', originally referring to a thousand paces, which evolved into a unit of distance. The logic of the compound is transparent: it literally denotes a great number of miles traveled. This literal sense, applied primarily to vehicles, has extended metaphorically in informal use to describe any person or thing that shows extensive use or wear.

Structure: high (great in amount/degree) + mileage (distance in miles) - high: From Old English hēah, of Germanic origin; related to Dutch hoog and German hoch. In this compound, it functions as an intensifier meaning 'great in amount or degree'. - mileage: From mile (from Old English mīl, from Latin mīlia 'thousands', short for mīlia passuum 'thousands of paces') + the noun-forming suffix -age (from Old French, from Latin -aticum). It functions as the core noun meaning 'distance in miles'.