verb (used with object)
to dislodge from a seat, especially to throw from a saddle, as a rider; unhorse.
to remove from political office by an elective process, by force, or by legal action: The corrupt mayor was finally unseated.

1590–1600; un-2 + seat

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unseat (ʌnˈsiːt)
1.  to throw or displace from a seat, saddle, etc
2.  to depose from office or position

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1596, "to throw down from a seat" (especially on horseback), from un- (2) + seat (v.). Meaning "to deprive of rank or office" is attested from 1611; especially of elected office in a representative body from 1834.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If you think you know one bigger in any species listed, you can nominate it,
  and perhaps unseat the reigning champ.
Fans cheered as the owl refused to budge, and officials conferred on how to
  unseat the winged predator.
The government was preparing a rushed new law, in an effort to unseat him, when
  he quit.
The government was preparing a rapid change in the law, in an effort to unseat
  him, when he resigned.
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