Etymology
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belch (v.)

Old English bealcan "bring up wind from the stomach," also "swell, heave," of echoic origin (compare Dutch balken "to bray, shout"). Extended to volcanoes, cannons, etc. 1570s. Related: Belched; belching. As a noun, "an act of belching," it is recorded from 1510s; also slang for "poor beer, malt liquor" (1706).

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Definitions of belch
1
belch (v.)
expel gas from the stomach;
Synonyms: burp / bubble / eruct
belch (v.)
become active and spew forth lava and rocks;
Synonyms: erupt / extravasate
2
belch (n.)
a reflex that expels gas noisily from the stomach through the mouth;
Synonyms: belching / burp / burping / eructation
From wordnet.princeton.edu