An onomatopoeic word for a single, audible gulp — used to describe swallowing quickly or nervously (similar to 'gokuri').
面接前に緊張して水を一口ごくっと飲んだ。
Nervous before the interview, I took a gulp of water.
彼は答えを考えながらごくっと唾を飲み込んだ。
He swallowed with a gulp while thinking of an answer.
薬が苦くて、思わずごくっと飲み込んだ。
The medicine was bitter, so I unconsciously gulped it down.