infiltrating

verb

1. 1

   To surreptitiously penetrate, enter or gain access to.

2. 2

   (of a liquid) To pass through something by filtration.

3. 3

   To cause (a liquid) to pass through something by filtration.

4. 4

   To invade or penetrate a tissue or organ.

   “High-grade tumors often infiltrate surrounding structures.”

5. 5

   To send (soldiers, spies etc.) through gaps in the enemy line.

6. 6

   (of an intravenous needle) To move from a vein, remaining in the body.