Definitions for unhorseʌnˈhɔrs
Random House Webster's College Dictionary
to cause to fall from a horse.
to dislodge, as from office; unseat.
Origin of unhorse:
unhorse, dismount, light, get off, get down(verb)
alight from (a horse)
To forcibly remove from a horse.
The knight was unhorsed when his opponent's lance struck his shield.
To disrupt or unseat; to remove from a position.
The incumbent governor was unhorsed by the scandal that broke during his reelection campaign.
to throw from a horse; to cause to dismount; also, to take a horse or horses from; as, to unhorse a rider; to unhorse a carriage