usurper
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/juːˈzɜːrpər/
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/juːˈzɜːpə(r)/
someone who takes control of a position or power without having the right to do so
The people were angry at the usurper who seized the throne without any right.
人們對於那個沒有權利就奪取王位的篡位者感到憤怒。