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infiltrate (v.)

1758, of fluids, from in- (2) "in" + filtrate (v.). Perhaps modeled on French infiltrer (16c.). Military sense of "penetrate enemy lines" attested from 1934. Related: Infiltrated; infiltrating.

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Definitions of infiltrate

infiltrate (v.)
cause (a liquid) to enter by penetrating the interstices;
infiltrate (v.)
enter a group or organization in order to spy on the members;
The student organization was infiltrated by a traitor
Synonyms: penetrate
infiltrate (v.)
pass into or through by filtering or permeating;
the substance infiltrated the material
infiltrate (v.)
pass through an enemy line; in a military conflict;
Synonyms: pass through
From wordnet.princeton.edu