VERB
夺取；篡夺；侵占
If you say that someone usurps a job, role, title, or position, they take it from someone when they have no right to do this.
例句
Did she usurp his place in his mother's heart?...
她取代了他在他母亲心目中的地位吗？
The Congress wants to reverse the reforms and usurp the power of the presidency.
议会企图颠覆改革，夺取总统权力。