unsaddle

un- +‎ saddle

unsaddle (third-person singular simple present unsaddles, present participle unsaddling, simple past and past participle unsaddled)

1. (transitive, intransitive) To remove a saddle.
   • 1593, Gervase Markham, A Discource of Horsmanshippe, London: Richard Smith, Chapter 3,

     […] sette him vppe, and tye him in his bridle to the bare Racke, and all to rubbe and chafe him, insomuch that if hee be eyther wette with sweate or any other thing, you leaue hym not till he be as dry as may be, then vnsaddle him, rub hys backe thorowly […]

   • 1773, Isaac Bickerstaffe, A School for Fathers, London: W. Griffin, Act III, Scene 6, p. 60,

     She’s gone, by the Lord! fairly stole away, with that poaching, concy-catching rascal! However, I won’t follow her; no, damme; take my whip, and my cap, and my coat, and order the groom to unsaddle the horses; I won’t follow her the length of a spur-leather.

   • 1857, Herman Melville, The Confidence-Man, New York: Dix, Edwards & Co., Chapter 25, p. 220,

     It was nigh noon, and we had stopped at the cabin to unsaddle and bait.

   • 1952, Neville Shute, The Far Country, London: Heinemann, Chapter One,

     Because this was the normal way of going to school the schoolhouse was provided with a paddock; the children rode in and unsaddled, hung their saddles and bridles on the fence, and went in to their lessons.

2. (transitive) To throw (a rider) from the saddle.