At that moment, someone knocked at the back door.

VOA: special.2010.06.12

They pretty much come in the front door. But the British pop in the window and nip out the back door,".

VOA: standard.2009.07.02

They closed the door and came back. They seemed to be getting ready to leave.

VOA: special.2009.07.04

I left the lights on, closed the door and went back to my apartment.

VOA: special.2009.07.25

Then a door slammed and she came back into the room.

VOA: special.2009.01.17

And when he was going out the door, he looked back and said "Well,I do not see anything about that frog that is any better than any other frog."

VOA: special.2009.08.29

We finally come back to the front door of the house.

VOA: special.2009.11.16

"So the fact that the UAE is pressuring RIM to essentially create a back door around its encryption, may actually threaten the reputation of BlackBerry as the most secure smartphone platform."

VOA: standard.2010.08.02