clincher

Definition of Clincher in English :

an argument that is conclusive

2. clincher, decisive factor

a point or fact or remark that settles something conclusively

3. clincher

a tool used to clinch nails or bolts or rivets

WordNet Lexical Database for English. Princeton University. 2010.

Clincher

noun

1. informal

something decisive, such as a fact, score, etc

2.

a person or thing that clinches

noun

a person or thing that clinches; specif., a conclusive or decisive point, argument, act, etc.

n.

1. One that clinches, as:

a. A nail, screw, or bolt for clinching.

b. A tool for clinching nails, screws, or bolts.

2. Informal A point, fact, or remark that settles something conclusively; a decisive factor.