A key resource to be used at an opportune moment; a trump:
One that helps:
a point or fact or remark that settles something conclusively
an argument that is conclusive
Something which ends another thing.
Find another word for clincher. In this page you can discover 14 synonyms, antonyms, idiomatic expressions, and related words for clincher, like: floorer, trump, trump card, ace-in-the-hole, help, win, decisive factor, determiner, determining factor, crusher and ender.