[verb] enter a group or organization in order to spy on the members; "The student organization was infiltrated by a traitor" Synonyms: infiltrate
[verb] make one's way deeper into ar through; "The hikers did not manage to penetrate the dense forest"
[verb] insert the penis into the vagina or anus of; "Did the molester penetrate the child?"
[verb] spread or diffuse through; "An atmosphere of distrust has permeated this administration"; "music penetrated the entire building" Synonyms: permeate, pervade, interdiffuse, imbue