usurp 
/jʊˈsɚp, Brit jʊˈzə:p/ verb
usurps; usurp·ing; usurped /jʊˈsɚp, Brit jʊˈzə:p/ verb [+ obj] formal : to take and keep (something, such as power) in a forceful or violent way and especially without the right to do so
▪ Some people have accused city council members of trying to usurp the mayor's power. ▪ attempting to usurp the throne — sometimes used figuratively ▪ Have we allowed their lies to usurp the truth?
▪ Some people have accused city council members of trying to usurp the mayor's power. ▪ attempting to usurp the throne — sometimes used figuratively ▪ Have we allowed their lies to usurp the truth?
— usur·pa·tion /ˌju:sɚˈpeɪʃən, Brit ˌju:zə:ˈpeɪʃən/ noun [noncount]
▪ the usurpation of power/authority
/ˌju:sɚˈpeɪʃən, Brit ˌju:zə:ˈpeɪʃən/ noun [noncount] ▪ the usurpation of power/authority
— usurp·er /jʊˈsɚpɚ, Brit jʊˈzə:pə/ noun, plural usurp·ers [count]
/jʊˈsɚpɚ, Brit jʊˈzə:pə/ noun, plural usurp·ers [count]
