unhook

from WordNet (r) 3.0 (2006)

unhook
    v 1: take off a hook [ant: {hook}]

from The Collaborative International Dictionary of English v.0.48

Unhook \Un*hook"\, v. t. [1st pref. un- + hook.]
   To loose from a hook; to undo or open by loosening or
   unfastening the hooks of; as, to unhook a fish; to unhook a
   dress.
   [1913 Webster]