Is there an onomatopoeia for gulp?

There isn't a perfect onomatopoeia for "gulp" that captures the sound of swallowing. However, here are some options depending on the context:

For a quick, quiet swallow:

* Gulp (the word itself can be used onomatopoeically)

* Slurp (suggests a liquid being swallowed)

* Swig (implies a large swallow)

For a louder, more forceful swallow:

* Glug (suggests a heavier, more audible gulp)

* Slurp (can also convey a louder, more forceful sound)

* Guzzle (implies a rapid and forceful swallow)

Ultimately, the best onomatopoeia depends on the specific situation and the desired effect.