leach /liːt͡ʃ/noun 3verb 3forms 3 noun3 •A tub or vat for leaching ashes, bark, etc. •A quantity of wood ashes, through which water passes, and thus imbibes the alkali. •A jelly-like sweetmeat popular in the fifteenth century. verb3 •To purge a soluble matter out of something by the action of a percolating fluid.Heavy rainfall can leach out minerals important for plant growth from the soil. •To part with soluble constituents by percolation.The gangue was leached to recover minerals left behind by the original technology. •(figurative) To bleed; to seep.A more generic geography, one where the suburb uneasily abuts the commercial and industrial, or leaches out to a nonurban frontier. — 2007 formsleached · leaching · leaches