Etymology
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unseat (v.)

1590s, "to throw down from a seat" (especially on horseback), from un- (2) "reverse, opposite of" + seat (v.). Meaning "to deprive of rank or office" is attested from 1610s; especially of elected office in a representative body from 1834. Related: Unseated; unseating.

updated on February 28, 2014

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Definitions of unseat from WordNet

unseat (v.)
remove from political office;
The Republicans are trying to unseat the liberal Democrat
unseat (v.)
dislodge from one's seat, as from a horse;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.