Learn how to say Jackpot correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word jackpot:
a large cash prize in a game or lottery, especially one that accumulates until it is won.
hit the jackpot
1win a jackpot.
2have great or unexpected success, especially in making a lot of money quickly:
the theatre hit the jackpot with its first musical
late 19th century: from jack1 + pot1. 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