belch

nouns

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

verbs

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