What is the meaning of the word "clinch"?

Definitions:

  1. to flatten the ends of nails and rivets copy to clipboard verb
    • They clinched the nails to secure the floorboards. copy to clipboard
  2. to secure or fasten by flattening the ends of nails or bolts copy to clipboard verb
    • The girder was clinched into the wall. copy to clipboard
  3. to settle conclusively copy to clipboard verb
    • They clinched the deal. copy to clipboard

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