in·fil·trate 
/ɪnˈfɪlˌtreɪt, ˈɪnfɪlˌtreɪt/ verb
in·fil·trates; in·fil·trat·ed; in·fil·trat·ing /ɪnˈfɪlˌtreɪt, ˈɪnfɪlˌtreɪt/ verb [+ obj] 1 a : to secretly enter or join (something, such as a group or an organization) in order to get information or do harm
▪ The gang was infiltrated by undercover agents. — sometimes used figuratively ▪ An attitude of cynicism has infiltrated the staff. [=the staff has become cynical]
b : to cause (someone) to secretly enter or join a group, organization, etc.
▪ Attempts to infiltrate undercover agents into the gang have failed. 2 technical : to pass into or through (something)
▪ Water can easily infiltrate the soil.
▪ The gang was infiltrated by undercover agents. — sometimes used figuratively ▪ An attitude of cynicism has infiltrated the staff. [=the staff has become cynical]
b : to cause (someone) to secretly enter or join a group, organization, etc.
▪ Attempts to infiltrate undercover agents into the gang have failed.
▪ Water can easily infiltrate the soil.
— in·fil·tra·tion /ˌɪnfɪlˈtreɪʃən/ noun [noncount]
▪ the infiltration of undercover agents into the gang
/ˌɪnfɪlˈtreɪʃən/ noun [noncount] ▪ the infiltration of undercover agents into the gang
— in·fil·tra·tor /ɪnˈfɪlˌtreɪtɚ, ˈɪnfɪlˌtreɪtɚ/ noun, plural in·fil·tra·tors [count]
▪ The gang discovered an infiltrator among its members.
/ɪnˈfɪlˌtreɪtɚ, ˈɪnfɪlˌtreɪtɚ/ noun, plural in·fil·tra·tors [count] ▪ The gang discovered an infiltrator among its members.
