The exact meaning of recede depends upon its context. For example:
"We can't move back in until the floodwaters recede." — diminish and move away
"Her fear receded." — diminished
"The waves first advance and then recede." — move away
"The news story receded into the background as it was replaced by new stories." — received diminished attention
"a receding hairline" — diminished hair (each year the line where hair stops growing is higher)
I was so good at being a kid, and so terrible at being whatever I was now I walked along the whole edge of the island until I found Daisy sitting on an uprooted barkless tree that had beached here as some flood receded.
There are no more uses of "recede" in Turtles All the Way Down.