To remove from a seat, especially from a saddle.(verb-transitive)
To dislodge from a location or position, especially to remove from office.(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unseat" in a sentence
"Other freshman classes have exerted a much more profound immediate influence, though in fairness some of the guys this year were shackled by the presence of more experienced players ahead of them who would have been difficult to unseat from the lineup."
"Looking for a sequel for an author isn't really logical but is some marketing person going to claim their next big author is going "unseat" some established author?"
"House of Representatives was to vote on a resolution to "unseat" the Mississippi delegation."