Definition of belly verb from the Oxford Advanced American Dictionary

 

belly

 verb
verb
NAmE//ˈbɛli//
 
[intransitive]belly (out)Verb Forms present simple I / you / we / they belly
 
he / she / it bellies
 
past simple bellied
 
-ing form bellying
 
 
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(especially of sails) to fill with air and become rounder The sails bellied out in the wind.
See the Oxford Advanced Learner's Dictionary entry: belly