S: (v) sneak in, creep in (enter surreptitiously) "He sneaked in under cover of darkness"; "In this essay, the author's personal feelings creep in"
S: (v) permeate, pervade, penetrate, interpenetrate, diffuse, imbue, riddle (spread or diffuse through) "An atmosphere of distrust has permeated this administration"; "music penetrated the entire building"; "His campaign was riddled with accusations and personal attacks"
S: (v) honeycomb (penetrate thoroughly and into every part) "the revolutionaries honeycombed the organization"
S: (v) pierce (make a hole into) "The needle pierced her flesh"