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]

WordNet (r) 3.0 (2006):

bellying
    adj 1: curving outward [syn: bellied, bellying, bulbous,
           bulging, bulgy, protuberant]