To achieve great success, especially unexpected good fortune or a significant windfall. To obtain exactly what one was hoping for, often beyond expectations.
This phrase comes from poker, specifically a variant where the pot accumulates until someone has a pair of jacks or better to 'open' the betting. The 'jackpot' grew larger with each hand until someone could claim it. Slot machines later adopted the term, and it entered general usage in the early 20th century.
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