The term "belly" can refer to several different meanings depending on context.
1) In a general sense, it could refer to the front part of one's body between the chest and hips, also known as the abdomen or stomach area. For example, if someone says they have a "big belly," it means their stomach is protruding outwards.
2) In a more specific sense, "belly" can refer to the front part of an animal such as a human or a bear.
3) It could also mean the underside of something, like the bottom surface of a table or boat that rests on the water.
4) Lastly, it could be used in reference to a person's emotions or feelings - for example, "she had a bad belly-ache" meaning she was feeling upset or sick.