The Collaborative International Dictionary of English v.0.48:

Unhand \Un*hand"\, v. t. [1st pref. un- + hand.]
   To loose from the hand; to let go.
   [1913 Webster]

         Hold off! unhand me, gray beard loon!
         Eftsoons his hand dropped he.            --Coleridge.
   [1913 Webster]

WordNet (r) 3.0 (2006):

unhand
    v 1: remove the hand from

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "unhand":
   cast loose, demobilize, discharge, dismiss, go bail for,
   grant bail to, leave go, let go, let go free, let loose,
   let loose of, let off, let out, parole, put on parole, release,
   unclasp, unclutch