I remember seeing this term on Genius at one point in time and can't for the life of me remember what it is. I Googled it and went to a Wikipedia page and remember it defined it as something along the lines of, "A second part to a song that has a significant style or tonal difference than the first. There is a quick change or shift in style." I'm fairly certain it started with an "S" as well.
The term describes the specific section that has a significant style change.
If you’ve heardKing’s Dead around 2:30 the entire song shifts to a totally new style and never returns to the original. That’s what I’m getting at.