usurp - definition and synonyms

verb [transitive] formal 

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/juːˈzɜː(r)p/
present tense
I/you/we/theyusurp
he/she/itusurps
present participleusurping
past tenseusurped
past participleusurped
  1. to take a job or position that belongs to someone else without having the right to do this

    Ingham resented anyone trying to usurp his authority.

derived word

usurper

noun [countable]
singularusurper
pluralusurpers