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infiltrate

verb [I + adv/prep, T]
 
 
/ˈɪn.fɪl.treɪt/

Definition

to secretly become part of a group in order to get information or to influence the way that group thinks or behaves: A journalist managed to infiltrate the powerful drug cartel.Affecting and influencing to move slowly into a substance, place, system, or organization: At about this time the new ideas about 'corporate management' had begun to infiltrate (into) local government.Slow and moving slowlyArriving, entering and invading infiltration
 
 
/ˌɪn.fɪlˈtreɪ.ʃən/ noun [U]
Slow and moving slowlyArriving, entering and invading
(Definition of infiltrate verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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