oppressor

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Schools may switch to English, the language of the former colonial oppressor, from next year.
从明年开始，学校可能转向英语，前殖民压迫者的语言。
It was that insistence, that belief that God resides in each of us, from the high to the low, in the oppressor and the oppressed, that convinced him that people and systems could change.
正是这种坚持，相信无论高低贵贱，是压迫者还是受压迫者，上帝都存在我们每个人心中，使他相信人和体制是可以改变的。
Only after the member of the pursued and persecuted race does a favor for his oppressor (when the hunted saves the hunter's life) does the hound grant the fox permission to continue living.
直到被追杀和迫害的种族中的一员帮了压迫者的忙（猎物救了猎人一命）时，猎狗才允许狐狸继续活下去。

The myth, perpetuated by De Gaulle, the big guy, was that in France everybody had resisted except for a few elites, and then France had risen up to follow his great shadow and had thrown off the oppressor and founded a republic.
传说中,这也被戴高乐延续了,大个子,在法国每个人,除了一小撮精英以外都参与了抵抗,然后法国跟随着他的光辉,崛起了,赶走了压迫者,建立了共和国
耶鲁公开课 - 1871年后的法国课程节选

Is the Irish miracle--Ireland now has a greater per capita income than its former oppressor, England--only a mirage?
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Israel will forever be the oppressor no matter how many murders terrorists commit.
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It is ridiculous to blame the antagonism on religious partisans, for men always desire to be the oppressor rather than the oppressed.
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someone who treats people in an unfair and cruel way and prevents them from having opportunities and freedom

An oppressor is a person or group of people that is treating another person or group of people cruelly or unfairly.