Meaning of “infiltrate” - Learner’s Dictionary


verb [ T ] uk us /ˈɪnfɪltreɪt/

to secretly join a group or organization so that you can learn more about them:

A journalist managed to infiltrate the gang of drug dealers.
infiltration uk us /ˌɪnfɪlˈtreɪʃən/ noun [ C, U ]
infiltrator noun [ C ]

(Definition of “infiltrate” from the Cambridge Learner’s Dictionary © Cambridge University Press)