Showdown definitions

shō'doun'
An event, especially a confrontation, that forces an issue to a conclusion.
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The laying down of the players' cards face up to determine the winner of the pot in poker.
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The displaying, faceup on the table, of the hands of all of the players who have not withdrawn as of the final round of betting, to determine who wins the pot.
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Any action or confrontation that brings matters to a climax or settles them.
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The final battle between two nemeses, in which there can be but one victor.
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The final round in a poker match, where the all remaining players' cards have to be put down on the table and shown.
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Origin of showdown

From show + down.