Verb (used with object), : Sir Gawain unhorsed the strange knight. ,His vigorous campaign unhorsed his adversary.    From Dictionary.com. 

And if thou abidest were thou art, he will unhorse thee.    From Wordnik.com.  [The Lilac Fairy Book] Reference

Democratic organization itself, to unhorse the Essex boss.    From Wordnik.com.  [Woodrow Wilson as I Know Him] Reference

Then, I am going to attempt to unhorse and otherwise disable them.    From Wordnik.com.  [The Death of Chaos]

I ready to shiver fifty lances with you there, and unhorse you with.    From Wordnik.com.  [Moby Dick; or the Whale] Reference

H should be sounded in the middle of words; as in forehead, abhor, behold, exhaust, inhabit, unhorse.    From Wordnik.com.  [The Handy Cyclopedia of Things Worth Knowing A Manual of Ready Reference] Reference

Again it passes through thorny woods with overhanging branches which continually threaten to unhorse the rider.    From Wordnik.com.  [Santo Domingo A Country with a Future] Reference

Scarcely did I catch her words, for a man sprang in, seizing my bridle-rein and leg and struggling to unhorse me.    From Wordnik.com.  [Chapter 17] Reference

I have it in my Power to tell the World a Tale, which will infallibly unhorse him -- whether I am in the House or out.    From Wordnik.com.  [John Adams diary 17, 16 April - 14 June 1771] Reference

She remembered men grabbing for her, trying to unhorse her, but she didn't recall their hands actually clawing at her.    From Wordnik.com.  [Men Don't Leave Me] Reference

Kahlan saw General Meiffert reach up, seize a fistful of chain mail, and unhorse the man who had been dragging her tent.    From Wordnik.com.  [Men Don't Leave Me] Reference

They were especially admired for the firmness with which they kept their saddles, under circumstances enough to unhorse a Centaur.    From Wordnik.com.  [Punchinello, Volume 1, No. 12, June 18, 1870] Reference

Wayland, after a vain struggle to disengage himself, and unhorse the urchin who clung to him; “do Kenilworth oaks bear such acorns?”.    From Wordnik.com.  [Kenilworth] Reference

And neither of them was able to unhorse the other.    From Wordnik.com.  [The Age of Chivalry] Reference

Then grappling, each endeavored to unhorse the other.    From Wordnik.com.  [National Epics] Reference

An uncongenial caller would instantly unhorse Carlyle, and.    From Wordnik.com.  [Little Journeys to the Homes of the Great - Volume 04 Little Journeys to the Homes of Eminent Painters] Reference

Now I shall do my endeavor to unhorse thee as I would an acknowledged peer in arms.    From Wordnik.com.  [Men of Iron] Reference

And look to it if it be courteous to unhorse a knight, who is ready to be thy servant.    From Wordnik.com.  [The Water of the Wondrous Isles] Reference

Only after a long, fierce fight did the Champion unhorse and slay this valiant knight.    From Wordnik.com.  [With Spurs of Gold Heroes of Chivalry and their Deeds] Reference

(Fawning over the false premises of a skilled demagogue is not the way to unhorse him.).    From Wordnik.com.  [The British National Party] Reference

Thus the point of the fir-tree caught him upon the shoulder and came near to unhorse him.    From Wordnik.com.  [The Blue Flower] Reference

I saw that to unhorse him would be to prostrate his spirit and cut his vanity to the quick.    From Wordnik.com.  [A Tour on the Prairies.] Reference

Chance might unhorse the individual, but with a community the element of chance was eliminated.    From Wordnik.com.  [Little Journeys to the Homes of the Great - Volume 11 Little Journeys to the Homes of Great Businessmen] Reference

His strength and prowess were such, that he never met an adversary who was able to unhorse him.    From Wordnik.com.  [The Lay of Marie] Reference

Franks to unhorse them and take them captive, till day departed and the night with darkness upstarted.    From Wordnik.com.  [Arabian nights. English] Reference

If thou turnest to flee, he will overtake thee, and if thou abidest where thou art, he will unhorse thee.    From Wordnik.com.  [The Lilac Fairy Book] Reference

Franks to unhorse them and take them prisoner, till the day departed and the night came with the darkness.    From Wordnik.com.  [The Book of the Thousand Nights and One Night, Volume II] Reference

Just because they don't unhorse him directly doesn't mean he will still have a trusty charger to ride in on.    From Wordnik.com.  [Pharyngula] Reference

'Begone!' he said to William; 'if you approach one step nearer I will deal you a blow that will unhorse you!.    From Wordnik.com.  [The Book of Romance] Reference

The object of the young Irishman was to unhorse, or rather uncamel, his antagonist, and get him to the ground.    From Wordnik.com.  [The Boy Slaves] Reference

French earl once tried to unhorse our King Edward I. when he was returning from Palestine, wearied by the journey.    From Wordnik.com.  [Old English Sports] Reference

I see a ring on thy hand -- the ruby ring I gave thee the day thou didst unhorse the uncircumcised deputy of Hunyades.    From Wordnik.com.  [The Prince of India — Volume 02] Reference

But a single touch of the magic lance was enough to unhorse them all, and one by one Bradamante sent them to their lord.    From Wordnik.com.  [The Red Romance Book] Reference

Rather that than let the first insane capering of his intellect unhorse him and leave him gibbering after a vanished mount.    From Wordnik.com.  [Fantazius Mallare A Mysterious Oath] Reference

Hastily mounting a fresh horse, Richard again attacked Des Barres, but could not unhorse the knight, who stuck fast to his saddle.    From Wordnik.com.  [With Spurs of Gold Heroes of Chivalry and their Deeds] Reference

Looking back at the boy he had attempted to unhorse, the cowman was leaning over far to the left in his saddle when Tad struck his horse.    From Wordnik.com.  [The Pony Rider Boys in Texas Or, The Veiled Riddle of the Plains] Reference