guān mén
to close a door
to lock a door
(of a shop etc) to close (for the night, or permanently)
guān mén dà jí
to close down a business for good and put the best face on it (idiom)
guān mén dì zǐ
last disciple of a master
guān mén zhuō zéi
to catch a thief by closing his escape route (idiom)