什么是 belly?See abdomen.The underside of the body of certain vertebrates, such as snakes and fish.Informal The stomach.Informal An appetite for food.The womb; the uterus.A part that bulges or protrudes: the belly of a sail. Anatomy The bulging, central part of a muscle.A deep, hollow interior: the belly of a ship. To bulge or cause to bulge. See Synonyms at bulge.belly up To approach closely: belly up to the bar.