American English

Definition of clincher noun from the Oxford Advanced American Dictionary

 

clincher

 noun
noun
NAmE//ˈklɪntʃər//
 
[usually singular] (informal)
 
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a fact, a remark, or an event that settles an argument, a decision, or a competition There was a lot of circumstantial evidence but they still needed a clincher, something cast iron that would carry a conviction. The Cardinals scored the clincher (= the winning run) in the 8th inning.
See the Oxford Advanced Learner's Dictionary entry: clincher