ごっくん - JP-EN Jisho

ごっくん

adverb taking the 'to' particleonomatopoeic or mimetic word

with a gulp

See also:

noun (common) (futsuumeishi)noun or participle which takes the aux. verb surutransitive verbonomatopoeic or mimetic word

gulping down (e.g. by a baby); swallowing