clincher
Preserved but no longer current.
That which rivets or confirms an argument, an incontrovertible position. Also a lie which cannot be surpassed, a stopper-up, said to be derived as follows:—Two notorious liars were backed to outlie each other. "I drove a nail through the moon once," said the first. "Right," said the other; "I recollect the circumstance well, for I went round to the back part of the moon and clinched it"—hence CLINCHER.
Era: ca. 1874 (Victorian)
Sources & notes
Historical definition reproduced from Hotten’s The Slang Dictionary (1874, public domain; Project Gutenberg #42108, retrieved 2026-07-31). Reflects the attitudes of its era.
Common questions
What does “clincher” mean?
That which rivets or confirms an argument, an incontrovertible position. Also a lie which cannot be surpassed, a stopper-up, said to be derived as follows:—Two notorious liars were backed to outlie each other. "I drove a nail through the moon once," said the first. "Right," said the other; "I recollect the circumstance well, for I went round to the back part of the moon and clinched it"—hence CLINCHER.
Is “clincher” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.