Gut (gat) n 1a. the lower part of the alimentary canal; intestine. 1b. the entire alimentary canal. 2. (often pl) the bowels or entrails esp. of an animal. 3. slang. the belly; paunch. 4. a silky fibrous substance extracted from silkworms used in the manufacture of fishing tackle. 5. a narrow channel or passage. 6. (pl) informal. courage, will power or daring; forcefulness….