Definitions for "Infiltrate"
To enter secretly (into an organization, territory, etc.) for hostile purposes, such as spying or sabotage; as, the FBI infiltrated into the U. S. communist party's upper echelons; also used transitively; as, to infiltrate the opponent's organization; to infiltrate one's agents into a hostile country.
sneak into something; enter secretly with an unfriendly purpose
enter a group or organization in order to spy on the members; "The student organization was infiltrated by a traitor"
To enter by penetrating the pores or interstices of a substance; to filter into or through something.
To penetrate gradually; -- sometimes used reflexively.
Water moving downward through soil.
an area of pneumonia in the lung
A poorly defined abnormal pulmonary density or any such density sharply bounded by pleura and fissures. This is a confusing term, since it may be used to indicate any abnormal lung density or, by others, as a synonym for consolidation. Synonymous with "fluid density."
a collection of fluid and cells in the tissues of the lung; visible on a chest x-ray in people with pulmonary TB disease
pass into or through by filtering or permeating; "the substance infiltrated the material"
pass through an enemy-line; in a military conflict
To pass troops in relatively small numbers through an opening in the enemy's position or his field of fire or through territory occupied by other troops or organizations.
Keywords:  seep, down
Seep down into.
(in-FILL-trait) material deposited as a result of filtration