What can that mean?
It could mean I hate “that”, like some terrible tasting food or foul drink, and I won’t allow it to pass down my throat.
Or I could have a sore throat, and the act of contracting my esophagus to move “that” from my mouth down my throat is so uncomfortable that I can’t perform the act.
Is “that” something that is unwelcome, or perhaps insulting, and I refuse to tolerate it any longer?
Maybe “that” is a lie, a fib, a tall tale, and I’m just not going to believe it.
Perhaps “that” is something I want to say, but shouldn’t, but I’m not going to suppress my feelings any longer.
As I was about to swallow the last swallow of water in the glass, the swallow swooped down from the cloud that had swallowed it and swallowed the bee that was causing me to swallow hard in fear.
No wonder English is so hard to learn. My kingdom for a synonym!