- The definition of a clincher is a point or moment that settles a contest or decision.
An example of a clincher is a game that secures a baseball team's position in the World Series.
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- One that clinches, as:a. A nail, screw, or bolt for clinching.b. A tool for clinching nails, screws, or bolts.
- Informal A point, fact, or remark that settles something conclusively; a decisive factor.