1. A person who oppresses or subjugates others; one who exercises authority in a burdensome or unjust manner
The oppressor ruled the kingdom with an iron fist.
O opressor governava o reino com mão de ferro.
2. Someone who uses force, authority, or power to suppress or control others unfairly
The freedom fighters rose up against their oppressor.
Os lutadores pela liberdade se levantaram contra seu opressor.