muck in WordNet English dictionary

1. fecal matter of animals
   droppings  dung  muck 
   
2. any thick, viscous matter
   sludge  slime  goo  goop  gook  guck  gunk  muck  ooze 
   

1. spread manure, as for fertilization
   manure  muck 
   
2. soil with mud, muck, or mire
   "The child mucked up his shirt while playing ball in the garden"
   mire  muck  mud  muck up 
   
3. remove muck, clear away muck, as in a mine
   muck