What is the meaning of clinch?

noun

• Boxing) the act of one boxer holding onto the other to avoid being hit and to rest momentarily. (
• A small slip noose made with seizing.
  • synonyms: clench
• The flattened part of a nail or bolt or rivet.
• A device (generally used by carpenters) that holds things firmly together.
  • synonyms: clamp
• A tight or amorous embrace.
  • usage: "come here and give me a big hug"
  • synonyms: hug, squeeze

verb

• Secure or fasten by flattening the ends of nails or bolts.
  • usage: "The girder was clinched into the wall"
• Hold a boxing opponent with one or both arms so as to prevent punches.
• Hold in a tight grasp.
  • usage: "clench a steering wheel"
  • synonyms: clench
• Embrace amorously.
• Flatten the ends (of nails and rivets. )
  • usage: "the nails were clinched"
• Settle conclusively.
  • usage: "clinch a deal"