Webster's English Dictionary

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jackpot

jack.pot \'jak-.pa:t\ n 1a1: a hand or game of draw poker in which a pair 
   of jacks or better is req uired to open 1a2: a large pot (as in poker) 
   formed by the accumulation of stakes from pr evious play 1b1: a combination 
   on a slot machine that wins a top prize or all the coins  in the machine 
   1b2: the sum so won  1c: a large fund of money or other reward formed by 
   the accumulation of pri zes 2: an impressive often unexpected success or 
   reward  chiefly West  3: a tight spot : JAM