permeate, pervade, penetrate, invade; see filter 1, insinuate 2, join 2.
"infiltrate." YourDictionary, n.d. Web. 01 August 2019. <https://thesaurus.yourdictionary.com/Infiltrate>.
infiltrate. (n.d.). Retrieved August 01st, 2019, from https://thesaurus.yourdictionary.com/Infiltrate
To introduce gradually and slyly:
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