Simple past tense and past participle of unhorse.(verb)
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Use "unhorsed" in a sentence
"And even though I see you now "unhorsed," I shall not lose my first impression, because I know that by and by you will be just like that again -- looking and feeling as if you were fit to conquer the world."
"Ryan was also to be unhorsed by earlier divorce accusations from his former wife, the actress Jeri Ryan, who accused the GOP standard-bearer of forcing her to go to S&M clubs and have sex in public."
"Only an excellent rider could have escaped being unhorsed, and as it was, Daylight was nastily near to it."