闭关

闭关	bì guān	to close the passes / to seal off the country / seclusion (monastic practice, e.g. of Chan Buddhists)
闭	bì	to close / to stop up / to shut / to obstruct
关	Guān	surname Guan
关	guān	mountain pass / to close; to shut; to turn off / to confine; to lock (sb) up; to shut (sb in a room, a bird in a cage etc) / to concern; to involve