Somebody at the door

Somebody at the door usually means someone wishes to enter a room or a building

We live in a security conscious age. Many doors into buildings and rooms are now locked at all times. Security men sit at a desk where there are computers and monitors showing all entries into a building, and the movement of traffic outside the building. The security desk usually faces the main entrance into the building. When somebody at the door wishes to enter
they are able to press a button so that the personmay enterthe building

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