leach /liːtʃ/ BrE AmE ( also leach out ) verb [intransitive and transitive]
[ Language: Old English ; Origin: leccan 'to make wet' ]
technical 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.