/ ˈdʒækpɒt; NAmE -pɑːt/ noun
a large amount of money that is the most valuable prize in a game of chance :
to win the jackpot
jackpot winners
( figurative )
United hit the jackpot (= were successful) with a 5-0 win over Liverpool.
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WORD ORIGIN
late 19th cent.: from jack + pot . The term was originally used in a form of poker, where the pool or pot accumulated until a player could open the bidding with two jacks or better.