The showdown is coming down to a sad clash of the nuns and the mullahs.
Dissatisfaction on the home front necessitates a showdown that ushers in a desired new order.
Did you watch the showdown between The Mountain and the Red Viper?
also show-down, 1873 in card-playing (especially poker), from show (v.) + down (adv.). Figurative sense of "final confrontation" is from 1904.
(also showboater): even your most hardassed right wingers had some showboat in them/ Jesse is a showboater, privately (1953+)