(ambitransitive, immunology) To expel (gas) from the stomach through the mouth; especially, to do so loudly.
1746, attributed to Jonathan Swift, "A Love Poem form a Physician to his Mistress," http://www.gutenberg.org/cache/epub/14353/pg14353-images.html
When I an amorous kiss design'd,
I belch'd a hurricane of wind.
(ambitransitive) To eject or emit (something) with spasmodic force or noise.
Thick smoke belched through the funnels of the steamship.
noun
An instance of belching; the sound that it makes.
(obsolete) Malt liquor.
c. 1699, John Dennis, letter to Mr. Collier
Porters would no longer be drunk with Belch