"Double Jeopardy" can refer to a couple of different concepts depending on the context:
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Legal Context: In legal terms, "double jeopardy" refers to the constitutional protection against being tried for the same crime twice. In the United States, the Fifth Amendment to the Constitution provides that no person shall "be subjected for the same offense to be twice put in jeopardy of life or limb," meaning that once a person is acquitted or convicted of a crime, they cannot be retried for that same offense.
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Television Game Show: "Double Jeopardy!" is also a term used in the popular quiz show "Jeopardy!" During the second round of the game, known as "Double Jeopardy," the value of the clues is increased, allowing contestants to earn more points than in the first round.
If you meant one of these definitions specifically, please let me know!