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Longman Dictionary of Contemporary English
infiltrate
verb
COLLOCATIONS FROM CORPUS
■ NOUN
group
▪ What would these people have to do if they did not infiltrate groups of young political activists?
▪ After all, in 1963 it had thoroughly infiltrated Chambliss' Klan group.
▪ He sent his men to infiltrate homosexual groups and smoke out deviants.
▪ Brothers' officials suggested the man was a spy that had infiltrated their group.
EXAMPLES FROM OTHER ENTRIES
▪ Everyone knew the organization had been infiltrated by government agents, but could not prove it.
▪ Federal undercover agents infiltrated a Miami drug ring.
▪ Police attempts to infiltrate neo-Nazi groups have been largely unsuccessful.
▪ The Communists effectively infiltrated the government and the political parties.
The Collaborative International Dictionary
Infiltrate

Infiltrate \In*fil"trate\, v. i. [imp. & p. p. Infiltrated; p. pr. & vb. n. Infiltrating.] [Pref. in- + filtrate: cf. F, s'infiltrer. Cf. Infilter.]

  1. To enter by penetrating the pores or interstices of a substance; to filter into or through something.

    The water infiltrates through the porous rock.
    --Addison.

  2. 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.

Infiltrate

Infiltrate \In*fil"trate\, v. t. To penetrate gradually; -- sometimes used reflexively.
--J. S. Mill.

Douglas Harper's Etymology Dictionary
infiltrate

1758, of fluids, from in- (2) "in" + filtrate. Related: Infiltrated; infiltrating. Military sense of "penetrate enemy lines" attested from 1934.

Wiktionary
infiltrate

vb. 1 To surreptitiously penetrate, enter or gain access. 2 To cause a fluid to pass through a substance by filtration. 3 To send soldiers through gaps in the enemy line. 4 (context intransitive of an intravenous needle English) To move from a vein, remaining in the body.

WordNet
infiltrate
  1. v. cause (a liquid) to enter by penetrating the interstices

  2. enter a group or organization in order to spy on the members; "The student organization was infiltrated by a traitor" [syn: penetrate]

  3. pass into or through by filtering or permeating; "the substance infiltrated the material"

  4. pass through an enemy-line; in a military conflict [syn: pass through]

Usage examples of "infiltrate".

The agents from the Egyptian counterintelligence branch suggested that Nancy bring this newly discovered asset to the attention of one of their agents, who was attempting to infiltrate Middle Eastern terrorist groups.

All I have to do is infiltrate a gang of Indian grave robbers and halt the flow of Anasazi artifacts out of this country.

One of the chatters knew that not long after the war began Diewerge had become manager of the Reich radio station in Danzig, and another had information on his doings in the postwar period: as the crony of other Nazi bigwigs, such as Achenbach, who became a Free Democratic member of the Bundestag, Diewerge allegedly infiltrated the liberal party of Nordrhein-Westfalen.

Once trained, the Contras were to be infiltrated across the border intoNicaraguato bring down the Sandinista regime.

The men and dogs soon became so adept at defense that the infiltrating team served only as a training mechanism for the defending team--the infiltrators always got caught.

He managed to infiltrate Gryffindor Tower, finding a way into the dorms that only a small rodent could.

There would have been no time to set up such a thing within the setting, but if there were other preplanned efforts, one of those groups could have sent a man to infiltrate the Druze effort.

What if the federal security boys had infiltrated the Gaters and were instigating this renewed outbreak of Gater activity?

Some suspected it was a plot of the Spaniards, infiltrating Haarlem and demoralizing the town before an attack.

From this point the hubs are in hands friendly to your enemies and the colonies are heavily infiltrated.

Hovering among the motes of dust dancing in those beams, and infiltrating the heavy stillness of the air amid the great columns that held up the roof of the Hypostyle Hall, it was easy to imagine that the spirit-form of Osiris could still be present.

They know that morphs had even infiltrated the home of one of their most important Controllers -- Chapman.

The disease is not myxedema because there is no peculiar physiognomy, no spade-like hands nor infiltrated skin, no alteration of the speech, etc.

God of the universe, he found most of his master systems infiltrated by alien programs of what he called the Other.

Grand Ayatollah Sistani, the real Shiite power center in Iraq, was in London for medical treatment, and Moqtada had infiltrated his people into the city of Najaf and eventually into the holiest of Shiite shrines, the Imam Ali Mosque.