adverb taking the 'to' particle
Mimetic adverb describing the sound or action of swallowing in one gulp. Often used with と.
See also: ゴクン
彼は水をごっくんと飲んだ。
He drank the water with a gulp.
noun, noun or participle which takes 'suru', transitive verb
Noun or する-verb describing the act of swallowing, especially by a baby or in a cute, childish context.
赤ちゃんがミルクをごっくんしている。
The baby is gulping down the milk.