Usage Note
Infiltrare means to penetrate or slip into a group or place covertly. The reflexive infiltrarsi (to infiltrate oneself) is very common: si sono infiltrati nell'organizzazione (they infiltrated the organization). It is also used in medicine (il liquido si infiltra nei tessuti) and in construction (water seeping through walls). Auxiliary for reflexive is essere.
Examples
"L'agente si è infiltrato nel gruppo criminale."
Natural Translation
The agent infiltrated the criminal group.
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