Etymology
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showdown (n.)

also show-down, 1873 in card-playing (especially poker) a slang term for the act of laying down the hands face-up, from show (v.) + down (adv.). Figurative sense of "final confrontation" is from 1904.

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Definitions of showdown

showdown (n.)
a hostile disagreement face-to-face;
From wordnet.princeton.edu