American English

Definition of showdown noun from the Oxford Advanced American Dictionary

 

showdown

 noun
noun
NAmE//ˈʃoʊdaʊn//
 
[usually singular]
 
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an argument, a fight, or a test that will settle a disagreement that has lasted for a long time Management is facing a showdown with union members today. Fans gathered outside the stadium for the final showdown (= the game that will decide the winner of the competition).
See the Oxford Advanced Learner's Dictionary entry: showdown