Meaning

noun an argument that is conclusive

noun a point or fact or remark that settles something conclusively

noun a tool used to clinch nails or bolts or rivets

originEtymology tree English clinch Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English clincher From clinch + -er.

Etymology from Wiktionary, CC BY-SA 3.0