clincher

From clinch +‎ -er.

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clincher (plural clinchers)

1. That which clinches; that which makes something final or firm; a decisive factor.

   The clincher was that we couldn't wait any longer to leave, or it would get dark.

   • 2011 December 10, Arindam Rej, “Norwich 4 - 2 Newcastle”, in BBC Sport‎^[1]:

     Newcastle's Dan Gosling was sent off for a foul on Russell Martin but Ba fired in to cut the deficit, before Holt nodded in the clincher.

   • 2022 April 12, Neil Johnston, “Real Madrid 2-3 Chelsea”, in BBC Sport‎^[2]:

     Even after what turned out to be the clincher, Hakim Ziyech, Kai Havertz and Jorginho went close to forcing a penalty shootout.

2. (cycling) A tyre with a bead around the edge to attach to the rim of the wheel when inflated.

Borrowed from German Klinker or French clinker.

clincher n (uncountable)

1. clinker