Definition of "oppress"

oppress

/əˈpɹɛs/

verb
third-person singular simple present oppresses, present participle oppressing, simple past and past participle oppressed
1. (transitive) To keep down by unjust force.
2. (transitive) To make sad or gloomy.
3. (transitive, obsolete) Physically to press down on (someone) with harmful effects; to smother, crush.
  Quotations
  Most mercilesse of women, VVyden hight, / Her other sonne fast sleeping did oppresse, / And with most cruell hand him murdred pittilesse.
  1590, Edmund Spenser, “Book II, Canto X”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie
4. (transitive, obsolete) To sexually violate; to rape.