How do you spell the sound of swallow?

There isn't one specific spelling for the sound of "swallow". It can be spelled in a few different ways depending on the word:

* "sw": This is the most common spelling, as seen in "swallow" itself.

* "s": This can also represent the "sw" sound, as in "sword".

* "wh": This can be pronounced as "w" in some words, such as "who" and "whole", which would sound like a soft "sw".

Ultimately, the spelling of the "swallow" sound depends on the specific word you're using.