ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: from show down to display one's hand at poker
1.
a. : the placing of poker hands faceup on the table to determine the winner of a pot
b. : cold hands
2. : the final settlement of a contested issue or the test of strength by which it is settled
emerged on the winning end of a 257-26 showdown in the House of Commons — Wall Street Journal