infiltrate
Transitive VerbIntransitive Verb
Meanings
Transitive Verb
[~ something]
To enter or gain access to an organization or place secretly and gradually, especially to acquire secret information or to undermine the group from within.
"The spy managed to infiltrate the enemy's high command over several months."
Transitive Verb
[~ something]
To pass slowly through a substance or a membrane, typically as a liquid or gas.
"The chemical agent began to infiltrate the porous rock layers of the soil."
Intransitive Verb
[~ into something]
To enter a place or organization secretly and gradually.
"Several undercover agents infiltrated into the gang to gather evidence."