Definition of gut noun from the Oxford Advanced American Dictionary

     

    gut

     noun
    noun
    NAmE//ɡʌt//
     
     
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  1. 1[countable] the tube in the body through which food passes when it leaves the stomach synonym intestine
  2. 2guts [plural] the organs in and around the stomach, especially in an animal I'll only cook fish if the guts have been removed.
  3. 3[countable] (informal) a person's stomach, especially when it is large synonym belly Have you seen the gut on him! a beer gut (= caused by drinking beer)
  4. 4 guts [plural] (informal) the courage and determination that it takes to do something difficult or unpleasant He doesn't have the guts to walk away from a high-paying job.
  5. 5 [countable] the place where your natural feelings that make you react in a particular way are thought to be I had a feeling in my gut that something was wrong.
  6. 6guts [plural] the most important part of something the guts of the problem see also catgut
  7. Idioms
      bust a gut(also bust your gut)(informal)
       
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    1. 1to laugh very hard The movie was so funny I busted my gut laughing.
    2. 2to put a lot of effort into something We busted a gut trying to fix the car, but it just wouldn’t move. I busted a gut to get you out of this mess!
    hate somebody's guts(informal)
     
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     to dislike someone very much
    run/sweat/work, etc. your guts out(informal)
     
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    to work very hard to achieve something I ran my guts out and only finished fourth.
    spill your guts (to somebody)(informal)
     
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    to tell someone everything you know or feel about something, because you are upset He has spilled his guts in his new autobiography.
See the Oxford Advanced Learner's Dictionary entry: gut