clincher

noun clinch·er \ˈklin-chər\

: a fact or statement that makes something certain or final

Full Definition of CLINCHER

: one that clinches: as

a : a decisive fact, argument, act, or remark <the expense was the clincher that persuaded us to give up the enterprise>

b : a tire with flanged beads fitting into the wheel rim

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1703

Synonyms: capper, coup de grâce (or coup de grace), crusher, topper, ace in the hole

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