clincher

名词 clincher:

1. an argument that is conclusive
   同义词：determiner, determining factor
2. a point or fact or remark that settles something conclusively
   同义词：decisive factor
3. a tool used to clinch nails or bolts or rivets

clinch.er

n.（名词）
One that clinches, as:
固定用的物品，如：
A nail, screw, or bolt for clinching.
铆钉：用于固定的钉子、螺丝或螺丝钉
A tool for clinching nails, screws, or bolts.
紧钳：固定钉子、螺丝或螺丝钉的工具
Informal A point, fact, or remark that settles something conclusively; a decisive factor.
【非正式用语】 关键话，定论：对彻底解决某事的重点、事实或评论；决定性因素