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in‧fil‧trate
1 [intransitive always + adverb/preposition, transitive] to secretly join an organization or enter a place in order to find out information about it or harm it : Police attempts to infiltrate neo-Nazi groups were largely unsuccessful.
Police attempts to infiltrate neo-Nazi groups were largely unsuccessful.2 [transitive] to secretly put people into an organization or place in order to find out information or to harm it
3 [transitive] to become a part of something - used especially to show disapproval : Commercialism has been infiltrating universities for the past decade.
Commercialism has been infiltrating universities for the past decade. —infiltrator noun [countable]
—infiltration noun [uncountable]
noun [uncountable]