belch in WordNet English dictionary

1. a reflex that expels gas noisily from the stomach through the mouth
   belch  belching  burp  burping  eructation 
   

1. expel gas from the stomach
   "In China it is polite to burp at the table"
   burp  bubble  belch  eruct 
   
2. become active and spew forth lava and rocks
   "Vesuvius erupts once in a while"
   erupt  belch  extravasate