clincher

[ klin-cher ]
/ ˈklɪn tʃər /

noun

a person or thing that clinches.
a statement, argument, fact, situation, or the like, that is decisive or conclusive: The heat was the clincher that made us decide to leave the city.
a nail, screw, etc., for clinching.
Automotive. a clincher tire.

Origin of clincher

1485–95; variant of Middle English clencher (clench + -er1)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for clincher

clincher

/ (ˈklɪntʃə) /

noun

informal something decisive, such as a fact, score, etc
a person or thing that clinches
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012