to secretly enter an organization or territory for hostile or espionage purposes

to flow or leak out slowly through pores or small openings

to permeate

the slow escape of liquid or gas through pores, cracks, or holes

water seepage

to ooze; to seep

measures taken against subversive external forces

a sewer or drainage ditch

a pit into which sewage or liquid waste is discharged to seep into the ground

(Tw) Anti-Infiltration Act (2020), which regulates the influence of entities deemed foreign hostile forces

bleeding (of ink, dye, paint, etc.)

horrifying; creepy

coffee percolator

to feel the penetrating chill of cold air