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English definition of “leach”

leach

verb [T]     /liːtʃ/ specialized
[I or T] When a chemical substance leaches or is leached from a material, especially soil, it is removed by the action of water passing through the material: The calcium, potassium, and magnesium ions are leached or washed out of the top soil into lower inaccessible subsoil.Removing and getting rid of thingsTaking things away from someone or somewherePhysical and chemical processes [T] When soil, etc. has been leached, it has had chemical substances removed from it: The soil has been so heavily leached through intensive farming that it is no longer fertile.
(Definition of leach verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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