Lockup \Lock"up`\,
   1. n. A place where persons under arrest are temporarily
      locked up; a watchhouse; a jail.
      
[1913 Webster]


   2. The act or state of temporary imprisonment in a lockup[1].
      [PJC]

   3. A malfunction in a machine having moving parts, such that
      the moving part cannot move; a seizure.
      [PJC]