From The Collaborative International Dictionary of English v.0.48 :
Belly \Bel"ly\, v. t. [imp. & p. p. Bellied; p. pr. & vb. n.
Bellying.]
To cause to swell out; to fill. [R.]
[1913 Webster]
Your breath of full consent bellied his sails. --Shak.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
bellying
adj 1: curving outward [syn: bellied, bellying, bulbous,
bulging, bulgy, protuberant]