穿墙

穿墙	chuān qiáng	(of a ghost, Wi-Fi signal etc) to pass through a wall
穿	chuān	to bore through; to pierce; to perforate / to go through (e.g. a tunnel); to cross (e.g. a street) / to thread; to string together / to wear; to put on (clothes, shoes etc.) / verb complement indicating thoroughness or completion
墙	qiáng	variant of 墙
墙	qiáng	wall (CL:面,堵) / (slang) to block (a website) (usu. in the passive: 被墙)