'Unseat' definitions:

Definition of 'unseat'

From: WordNet
verb
Remove from political office; "The Republicans are trying to unseat the liberal Democrat"
verb
Dislodge from one's seat, as from a horse

Definition of 'Unseat'

From: GCIDE
  • Unseat \Un*seat"\, v. t. [1st pref. un- + seat.] [1913 Webster]
  • 1. To throw from one's seat; to deprive of a seat. --Cowper. [1913 Webster]
  • 2. Specifically, to deprive of the right to sit in a legislative body, as for fraud in election. --Macaulay. [1913 Webster] [1913 Webster]