'Dirty' in the Bible

Son of man, make a song of grief for Pharaoh, king of Egypt, and say to him, Young lion of the nations, destruction has come on you; and you were like a sea-beast in the seas, sending out bursts of water, troubling the waters with your feet, making their streams dirty.

Does it seem a small thing to you to have taken your food on good grass-land while the rest of your grass-land is stamped down under your feet? and that after drinking from clear waters you make the rest of the waters dirty with your feet?

And as for my sheep, their food is the grass which has been stamped on by your feet, and their drink the water which has been made dirty by your feet.