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infiltrate

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verb [intransitive/transitive] infiltrate pronunciation in British English /ˈɪnfɪltreɪt/ 
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present tense
I/you/we/theyinfiltrate
he/she/itinfiltrates
present participleinfiltrating
past tenseinfiltrated
past participleinfiltrated
  1. 1
    to secretly join an organization or go into a place in order to find out information about it or damage it

    Government agents had been infiltrating paramilitary groups.

    infiltrate into:

    plans to prevent rebels from infiltrating into the country

derived words

infiltration

 infiltrate pronunciation in British English /ˌɪnfɪlˈtreɪʃ(ə)n/  noun [uncountable]

infiltrator

noun [countable]
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singularinfiltrator
pluralinfiltrators

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