ridden (adj.)youdaoicibaDictYouDict[ridden 词源字典]
mid-14c., from past participle of ride (q.v.). Sense evolution, via horses, is from "that which has been ridden upon, broken in" (1520s) to, in compounds, "oppressed, taken advantage of" (1650s).[ridden etymology, ridden origin, 英语词源]