Etymology
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run-down (adj.)

1866, of persons, "to have the health or strength reduced," from the verbal phrase; see run (v.) + down (adv.). From 1896 of places, "dilapidated, shabby, seedy;" by 1894 of clocks, etc., "completely unwound." The earliest sense is "oppressed" (1680s). Compare rundown (n.).

The verbal phrase run down as "have the motive power exhausted" (of clocks, etc.) is by 1761; of persons, etc., "become weak or exhausted," by 1828. To run (something or someone) down "disparage, abuse" is by 1660s. 

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Definitions of run-down

run-down (adj.)
worn and broken down by hard use;
a run-down neighborhood
Synonyms: creaky / decrepit / derelict / flea-bitten / woebegone
run-down (adj.)
having the spring unwound;
a run-down watch
From wordnet.princeton.edu