unsaddle means to remove a saddle. Lexicurio rates it Sui generis — a strength score of 85 out of 100.
Etymology
From Middle English onsadelen, unsadelen, unsadlen, equivalent to un- + saddle.
verb
- To remove a saddle.“[…] 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 […]”
- To throw (a rider) from the saddle.