un·seat 
/ˌʌnˈsi:t/ verb
un·seats; un·seat·ed; un·seat·ing /ˌʌnˈsi:t/ verb [+ obj] 1 : to remove (someone or something) from a position of power or authority
▪ He unseated an incumbent senator. 2 : to cause (someone) to fall from a seat or saddle
▪ The horse bucked and unseated its rider.
▪ He unseated an incumbent senator.
▪ The horse bucked and unseated its rider.
