Main entry: pass through, infiltrate
Definition: pass through an enemy line; in a military conflict
Main entry: infiltrate
Definition: pass into or through by filtering or permeating
Usage: the substance infiltrated the material
Main entry: infiltrate
Definition: cause (a liquid) to enter by penetrating the interstices
Main entry: penetrate, infiltrate
Definition: enter a group or organization in order to spy on the members
Usage: The student organization was infiltrated by a traitor