What is the meaning of guts?

noun

• The part of the alimentary canal between the stomach and the anus.
  • synonyms: intestine, bowel, gut
• A narrow channel or strait.
  • synonyms: gut
• A strong cord made from the intestines of sheep and used in surgery.
  • synonyms: catgut, gut
• Fortitude and determination.
  • usage: "he didn't have the guts to try it"
  • synonyms: backbone, grit, moxie, sand, gumption

verb

• Empty completely; destroy the inside of.
  • usage: "Gut the building"
  • synonyms: gut
• Remove the guts of.
  • usage: "gut the sheep"
  • synonyms: gut