infiltrate
verb (used with object)
to filter into or through; permeate.
had been infiltrating
-
past perfect progressiveof infiltrate.past perfect progressive
Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Crowley's Ordo Templi Orientis in Pasadena, California — became publicly known, Hubbard explained that he had been infiltrating the organization on the behalf of the United States military.
From Salon ● Aug. 30, 2020
For well over a decade, his spies had been infiltrating the United States, burrowing their way into private companies, schools, laboratories, and even government offices.
From "Spies: The Secret Showdown Between America and Russia" by Marc Favreau
