the world > physical sensation > cleanness and dirtiness > dirtiness > pollution or defilement > pollute or defile [verb (transitive)] > render thick with sediment (3)
transitive. To make (water) turbid or muddy by stirring up sediment. Frequently figurative or in figurative contexts, now esp. in to roil the waters…
transitive. To make (a liquid) turbid or cloudy by stirring up mud, silt, etc.; to muddy; (in later use sometimes more generally) to stir up…