Door/dɔːr/ Definition 1 of 3Pro Tip 1/3Physical Object Refers specifically to the physical barrier of a door, not the action of using it. The old wooden door creaked as it opened. Pro Tip 2/3Privacy Marker Indicates privacy or boundary; knocking shows respect for privacy. He knocked on the door to check if the meeting was over. Pro Tip 3/3Metaphor Potential Can act metaphorically as a transition point between different experiences or emotions. Walking through the door, she left her fears behind.