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INFILTRATE

Definition:

[verb] cause (a liquid) to enter by penetrating the interstices
[verb] enter a group or organization in order to spy on the members; "The student organization was infiltrated by a traitor"
Synonyms: penetrate
[verb] pass into or through by filtering or permeating; "the substance infiltrated the material"
[verb] pass through an enemy-line; in a military conflict
Synonyms: pass through