Definition of usurp verb from the Oxford Advanced Learner's Dictionary

 

usurp

 verb
verb
BrE BrE//juːˈzɜːp//
 
; NAmE NAmE//juːˈzɜːrp//
 
Verb Forms present simple I / you / we / they usurp
BrE BrE//juːˈzɜːp//
 
; NAmE NAmE//juːˈzɜːrp//
 
he / she / it usurps
BrE BrE//juːˈzɜːps//
 
; NAmE NAmE//juːˈzɜːrps//
 
past simple usurped
BrE BrE//juːˈzɜːpt//
 
; NAmE NAmE//juːˈzɜːrpt//
 
past participle usurped
BrE BrE//juːˈzɜːpt//
 
; NAmE NAmE//juːˈzɜːrpt//
 
-ing form usurping
BrE BrE//juːˈzɜːpɪŋ//
 
; NAmE NAmE//juːˈzɜːrpɪŋ//
 
 
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usurp somebody/something (formal) to take somebody’s position and/or power without having the right to do this Word Origin Middle English (in the sense ‘appropriate a right wrongfully)’: from Old French usurper, from Latin usurpare ‘seize for use’.Extra examples Democratically elected representatives should not be usurped by pressure groups. He attempted to usurp the principal’s authority. She is scheming to take my place and usurp my power.
See the Oxford Advanced American Dictionary entry: usurp