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I was at doctor office few days back and there was lady who was trying to come in the office.But couldn't as the door was locked. I told the nurse there that "somebody is on the door" and she replied back saying you mean "somebody is at the door ?".
Which one is correct ?
A bouncer, security guard or doorman is said to be 'on the door', meaning in charge of the admission of those people who are at the door.
'at the door' is always correct when referring to someone knocking/using the doorbell.
'on the door' is wrong in 99% of the cases. Like someone else said, "on the door" is only correct should you want to express that someone is physically standing on top of the door.
And while JaththeGod's answer is correct, there are cases where you cannot use logic: "on the phone" for instance. Doesn't mean you're part of something, but it's still used that way.
There are several definitions of On. But On would generally be used if you're a part of something such as "I am on the team." Or sometimes being physically atop of something. "I am standing on the table." At is used when someone is somewhere, a location. "I am at the mall." "I am at the corner of the street."
