what does the word "clinch" mean in the text below?

English as a Second Language English Vocabulary, Grammar and Idioms
1

perhaps this final act was meant
to “clinch” a lifetime’s argument

2

It means to ensure victory or seal the victory.

3

Thank you Luschen, what’s the name of the skyscraper of Nashville?

4

Which one? There are quite a few skyscrapers in Nashville.[YSaerTTEW443543]

TOEIC listening, photographs: Shopping in the market[YSaerTTEW443543]

5

Well … there are either “quite a few” or “none” - I guess it depends on your definition of a skyscraper! Here is the most famous one I guess: en.wikipedia.org/wiki/AT%26T_Bui … shville%29 - everyone calls it “The Batman Building”