Infiltrate /(?)/

In·fil·trate

Infiltrate

v. i.

imp. & p. p. Infiltrated; p. pr. & vb. n. Infiltrating

  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.
  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

v. t.
  1. To penetrate gradually; -- sometimes used reflexively.