UNSADDLE
unsaddle, offsaddle
(verb) remove the saddle from; “They unsaddled their mounts”
Source: WordNet® 3.1
Etymology
Verb
unsaddle (third-person singular simple present unsaddles, present participle unsaddling, simple past and past participle unsaddled)
(transitive, intransitive) To remove a saddle.
(transitive) To throw (a rider) from the saddle.
Source: Wiktionary
Un*sad"dle, v. t. Etym: [1st pref. un- + saddle.]
1. To strip of a saddle; to take the saddle from, as a horse.
2. To throw from the saddle; to unhorse.
Source: Webster’s Unabridged Dictionary 1913 Edition