Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: JACK12 + POT1; from a card game in which a player needs two jacks to begin

jackpot

 noun
     
jack‧pot [countable]
a large amount of money that you can win in a game that is decided by chance:
a £50,000 jackpot
jackpot winners

➔ hit the jackpot

at hit1 (25)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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