at the door

Prepositional phrase

 * 1) Ringing the doorbell or knocking on the door.
 * 2) At the first threshold of the event itself rather than in advance.
 * 1) Ringing the doorbell or knocking on the door.
 * 2) At the first threshold of the event itself rather than in advance.
 * 1) At the first threshold of the event itself rather than in advance.