Source : Webster's Revised Unabridged Dictionary (1913)

Ganch \Ganch\, v. t. [Cf. F. ganche, n., also Sp. & Pg. gancho
   hook, It. gancio.]
   To drop from a high place upon sharp stakes or hooks, as the
   Turks dropped malefactors, by way of punishment.

         Ganching, which is to let fall from on high upon hooks,
         and there to hang until they die.        --Sandys.