Meaning of the word cincher in English

What does cincher mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

cincher

US /ˈsɪn.tʃər/
UK /ˈsɪn.tʃər/

Noun

a person or thing that makes something certain

Example:
The last goal was the cincher for their victory.
His strong argument was the cincher that convinced the jury.