The Collaborative International Dictionary of English v.0.48:
Unyoke \Un*yoke"\, v. t. [1st pref. un- + yoke.] [1913 Webster] 1. To loose or free from a yoke. "Like youthful steers unyoked, they take their courses." --Shak. [1913 Webster] 2. To part; to disjoin; to disconnect. --Shak. [1913 Webster]WordNet (r) 3.0 (2006):
unyoke v 1: remove the yoke from; "unyoke the cow" [ant: yoke]