What is a leacher?

A leacher is a person who engages in leaching, a process where substances, typically nutrients or chemicals, are washed out from soil or other materials by water or other solvents. In agriculture, leaching can lead to the loss of essential nutrients from the soil, while in environmental contexts, it can refer to the movement of contaminants into groundwater. The term can also be used more broadly to describe someone who exploits or takes advantage of others.