"infiltrates" in the verb sense
1. infiltrate
cause (a liquid) to enter by penetrating the interstices
2. infiltrate, penetrate
enter a group or organization in order to spy on the members
"The student organization was infiltrated by a traitor"
3. infiltrate
pass into or through by filtering or permeating
"the substance infiltrated the material"
4. infiltrate, pass through
pass through an enemy line in a military conflict
Source: WordNet® (An amazing lexical database of English)
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