This was a clincher—assorted worthies sent their own medals back in protest but everyone else was delighted.
Conclusive as this argument is, there is yet another in reserve, which is a clincher.
The movie-maker was in his element now, delivering the clincher in an argument.
This was a clincher, and the sceptic joined in the laugh at his own expense.
This proved a clincher, and the lumbermen changed the subject.
This last sentiment impressed these beardless youths as a clincher, and there was a pause.
Late in 1813, appeared the “Book of Wonders,” “in five parts,” and it was a clincher.
It is a clincher which no sophistry can set aside, no reasoning can grapple with, and no logic overthrow.
The last remark was intended as a clincher to settle the affair.
"You're a convoluted mule," returned the ghost, tapping the enameled wall with his knuckle, as a clincher to his assertion.
early 14c., "person or thing that clinches" (i.e., secures nails by bending down or riveting the pointed end), late 15c. as a class of shipyard worker; agent noun from clinch (v.). As a type of nail, from 1735; as a conclusive statement, argument, etc., 1737.
The deciding or conclusive element; the BOTTOM LINE: One smudged fingerprint was the clincher (1830s+)