英语词源字典 - 在线词源网站

hound (v.)[hound 词源字典]: "hunt with hounds," 1520s, from hound (v.). Sense of "pursue relentlessly" is first recorded c. 1600. Related: Hounded; hounding.[hound etymology, hound origin, 英语词源]
oppress (v.): mid-14c., from Old French opresser "oppress, afflict; torment, smother" (13c.), from Medieval Latin oppressare, frequentative of Latin opprimere "press against, press together, press down;" figuratively "crush, put down, subdue, prosecute relentlessly" (in Late Latin "to rape"), from ob "against" (see ob-) + premere "to press, push" (see press (v.1)).
It is the due [external] restraint and not the moderation of rulers that constitutes a state of liberty; as the power to oppress, though never exercised, does a state of slavery. [St. George Tucker, "View of the Constitution of the United States," 1803]
Related: Oppressed; oppressing.
relentless (adj.): 1590s, from relent + -less. Related: Relentlessly; relentlessness.