| Verb | 1. | infiltrate - cause (a liquid) to enter by penetrating the interstices | |
| 2. | infiltrate - enter a group or organization in order to spy on the members; "The student organization was infiltrated by a traitor"join, fall in, get together - become part of; become a member of a group or organization; "He joined the Communist Party as a young man" | |
| 3. | infiltrate - pass into or through by filtering or permeating; "the substance infiltrated the material" | |
| 4. | infiltrate - pass through an enemy-line; in a military conflictgo across, pass, go through - go across or through; "We passed the point where the police car had parked"; "A terrible thought went through his mind" | |