History
History
History
UK
US
Meaning:

to join (a group), enter (an area) in order to harm, find information, influence changes etc; (of ideas) to pass into (people's minds)

creep in

penetrate permeate pervade access crack foist impregnate insinuate percolate saturate tinge edge in filter through sneak in work into worm into
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INFILTRATE as in Wiktionary
INFILTRATE as in Wikipedia