Noun

• S: (n) belch, belching, burp, burping, eructation (a reflex that expels gas noisily from the stomach through the mouth)

Verb

• S: (v) burp, bubble, belch, eruct (expel gas from the stomach) "Please don't burp at the table"
• S: (v) erupt, belch, extravasate (become active and spew forth lava and rocks) "Vesuvius erupts once in a while"