Jackpot \Jackpot\, n.
   1. Same as {jack pot}. See under {jack}.
      [PJC]

   2. Any larger-than-usual gambling prize formed by the
      accumulation of unwon bets.
      [PJC]

   3. The highest gambling prize awarded in a gambling game in
      which smaller prizes are also awarded, especially such a
      prize on a slot machine.
      [PJC]

   4. An unusually large success in an enterprise, either
      unexpected or unpredictable, esp. one providing a great
      financial benefit.
      [PJC]

   {hit the jackpot} to receive an unexpectedly large (or the
      largest possible) benefit from an enterprise; as, after
      prospecting for years, he finally hit the jackpot when he
      discovered a silver lode.
      [PJC]