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English definition of “leach”

leach

verb [T] uk   /liːtʃ/ specialized us  
[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. [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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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