Definitions of muddy:

• verb:   make turbid

  Example: "Muddy the water"

• verb:   cause to become muddy
• verb:   dirty with mud
• adjective:   dirty and messy; covered with mud or muck

  Example: "Muddy boots"

• adjective:   (of especially liquids) clouded as with sediment

  Example: "Muddy coffee"

• adjective:   (of color) discolored by impurities; not bright and clear

  Example: "Muddy colors"

• adjective:   (of soil) soft and watery

  Example: "Muddy barnyard"