clinch·er
noun/ˈklɪntʃə(r)/
/ˈklɪntʃər/
[usually singular] (informal)- a fact, a remark or an event that settles an argument, a decision or a competition
起决定性作用的事实（或话语、事情） - There was a lot of circumstantial evidence but they still needed a clincher, something cast iron that would carry a conviction.
有很多间接证据，但他们仍然需要一个铁证，一个可以让人定罪的铸铁铁证。 - Sixsmith scored the clincher (= the winning goal) after 81 minutes.
81 分钟后，西克史密斯得了决定胜负的一分。
- There was a lot of circumstantial evidence but they still needed a clincher, something cast iron that would carry a conviction.