cake
caked with mud

flat
mud flat

mud
river mud

MUD
Multiuser Domain / Multiuser Dungeon / Multiuser Dimension

plaster over
he was plastered over with mud

plough
he ploughed his way through the mud

plump
he fell plump into the mud

plunge into
to plunge into the mud

sink
the cart had sunk into the mud

slick
the road was slick with the mud

spatter
a spatter of mud

splash
to splash with mud

spot
spots of mud

stick
to stick in the mud

stick-in-the-mud
caturra

stuck
stuck in the mud

sure
...sure as mud

telltale
the telltale mud on his shoes