broken-down

The compound adjective 'broken-down' is a relatively modern English formation, emerging in the 18th century. It is a straightforward combination of the past participle 'broken', from the Old English verb brecan (to shatter, fracture), and the adverb 'down', which implies a direction or state of decline. The literal sense of something being physically shattered and fallen down evolved metaphorically to describe machinery, vehicles, or even people that are in a state of complete disrepair, exhaustion, or failure. The logic is transparent: just as a structure that is broken and has fallen down is ruined, so is a 'broken-down' car or system.

Structure: broken (adjective) + down (adverb) - broken: From Old English brocen, past participle of brecan (to break). In this compound, it functions as an adjective meaning 'shattered' or 'not functioning'. - down: From Old English dūne, short for of dūne (from the hill). In this compound, it functions as an adverb meaning 'into a state of disrepair or collapse'.