Jackpot definitions

jăk'pŏt'
A lucky development or substantial success.
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The accumulated stakes in a kind of poker that requires one to hold a pair of jacks or better in order to open the betting.
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The largest prize or reward in various games or contests.
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A pot in a poker game made up of accumulated stakes, which can be played for only when some player has a pair of jacks or better with which to open.
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Any cumulative stakes or highest prize, as in a slot machine.
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A money prize pool which accumulates until the conditions are met for it to be won.
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A large cash prize or money.
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An unexpected windfall or reward.
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(Western US) A difficult situation.
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A jumble of felled timber.
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Origin of jackpot

Attested as jack-pot (“big prize”), 1944; from sense "slot machine" (1932), from obsolete poker sense (1881) "antes that begin when no player has a pair of jacks or better"; from jack (“playing card”) + pot.