noun
plural bellies
[count] a person's stomach or the part of the body that contains the stomach
the part of an animal's body that is like a person's belly
a curved or rounded surface or part
verb
bellies; bellied; bellying
to cause (something, such as a sail) to curve or bulge outward [+ obj]
belly up to
[phrasal verb]
belly up to (someone or something) US informal :to walk to or toward (someone or something)