To remove soluble substances from the soil by percolating water through the soil
To remove soluble or other constituents from a medium by the action of a percolating liquid, as in leaching salts from the soil by the application of water
To remove the soluble constituents from by subjecting to the action of percolating water or other liquid; as, to leach ashes or coffee
The roots of the word are Old English leccan, to water The definition is to dissolve out For example, heavy rains have leached the minerals from the soil