Declan

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The Japanese word

対決

is pronounced
taiketsu | たいけつ
means
showdown
Examples:
相反する理想を抱いた二つの強力な勢力が対決するのは、最終手段の時である。
sōhan suru risō o dai ta futatsu no kyōryoku na seiryoku ga taiketsu suru no wa, saishū judan no toki de aru.
When two powerful forces with opposite ideals come face to face, it's time for a showdown.
Examples sourced from tatoeba.org