run-down (adj.)youdaoicibaDictYouDict[run-down 词源字典]
1866, of persons, with reference to health, from verbal phrase, from run (v.) + down (adv.). From 1896 of places; 1894 of clocks. Earliest sense is "oppressed" (1680s).[run-down etymology, run-down origin, 英语词源]