noun The alimentary canal, especially the intestine.
noun The abdomen of a person, especially one that is enlarged.
You've developed quite a beer gut since I last met you.
noun The intestines of an animal used to make strings of a tennis racket or violin, etc.
noun A person's emotional, visceral self.
I have a funny feeling in my gut.
noun A class that is not demanding or challenging.
You should take Intro Astronomy: it's a gut.
noun A narrow channel, passage, or stream of water.
the Gut of Canso
noun The sac of silk taken from a silkworm when ready to spin its cocoon, for the purpose of drawing it out into a thread. When dry, it is exceedingly strong, and is used as the snood of a fishing line.