[{"Bold_text": "verb (used with object)", "List Items": ["to filter into or through; permeate .", "to cause to pass in by filtering.", "to move into (an organization, country, territory, or the like) surreptitiously and gradually, especially with hostile intent:The troops infiltrated the enemy lines.", "to pass a small number of (soldiers, spies, or the like) into a territory or clandestinely and with hostile or subversive intent:The intelligence agency infiltrated three spies into the neighboring country."]}, {"Bold_text": "verb (used without object)", "List Items": ["to pass into or through a substance, place, etc., by or as by filtering.", "Pathology.to penetrate tissue spaces or cells."]}, {"Bold_text": "noun", "List Items": ["something that infiltrates.", "Pathology.any substance penetrating tissues or cells and forming a morbid accumulation."]}]