He closed the door behind him as he left.
Meaning: This means that he moved the door to cover the opening after he went away from the room.
Choice of Words: Closed means to move something to cover an opening. Door is a movable panel that opens and closes to provide access to a building or room. Behind means at the back of something. Left means to go away from a place. The sentence describes someone leaving a room.
Alternative Expressions
Related Expressions