unharness

from WordNet (r) 3.0 (2006)

unharness
    v 1: remove the harness from; "unharness a horse" [ant:
         {harness}, {tackle}]

from The Collaborative International Dictionary of English v.0.48

Unharness \Un*har"ness\, v. t. [1st pref. un- + harness.]
   1. To strip of harness; to loose from harness or gear; as, to
      unharness horses or oxen. --Cowper.
      [1913 Webster]

   2. To disarm; to divest of armor. --Holinshed.
      [1913 Webster]