From Longman Dictionary of Contemporary Englishleachleach /liːtʃ/ (also leach out) verb [intransitive, transitive] technicalHE if a substance leaches or is leached from a larger mass such as the soil, it is removed from it by water passing through the larger mass The manufacturers say that there is no danger of the aluminium leaching into the water.→ See Verb table
Examples from the Corpus
leach• Drainage had already leached away much of the water resources of the Great Plains grain belt.• Plastics not intended for food use vary: some may leach dye into the water, and some can be toxic.• Nitrates from fertilizers leached into the rivers.• Constantly running water through gravel means that any hardness will be leached into the water.• But, with heavier stocking, even grass leaches more nitrate.• I would sweat so hard that my shirt collar turned white from the salt leached out from my body.• For some minutes Harry sat extremely still to leach the sting.• Everything from erosion to leaching to iron rainstorms is possible, perhaps much more.• Heap leaching uses chemical solutions to dissolve gold from heaps of crushed ore.Origin leach Old English leccan “to make wet” 