the world > space > relative position > closed or shut condition > [adjective] > closed or shut > closed (of an aperture) (5)
Properly or thoroughly closed with, or as if with, a plug or stopper.
Obstructed, blocked. Of a hole or crevice: Filled up.
Stopped up or filled with, or as with, a plug; (in early use) spec. (of an explosive shell) having a plug instead of a fuse.