Definition of infiltrating:
(v) :
(ambitransitive) To surreptitiously penetrate, enter or gain access to.
(v) :
(transitive) To cause to penetrate in this way.
(v) :
(ambitransitive, of a liquid) To pass through something by filtration.
(v) :
(ambitransitive, medicine) To invade or penetrate a tissue or organ.
(v) :
(transitive, military) To send (soldiers, spies, etc.) through gaps in the enemy line.
(v) :
(intransitive, of an intravenous needle) To move from a vein, remaining in the body.