What is "muddy up"

Usage examples of "muddy up".

She left him, almost ran up the stairs, before everything could spill out, the stupid recriminations and accusations that would not solve anything but only muddy up whatever poor honesty they had been able to manage.

Illester, the head manservant, seemed to think I was there to steal the silver and muddy up the carpets.

Illester, the head manservant, seemedto think I was there to steal the silver and muddy up thecarpets.

Suppose this was the very point she needed to muddy up in order to protect herself?

Besides, what point is there in writing about something that would serve no other purpose than to muddy up such beautiful, pristine waters?