Down" is used many different ways, and its spiritual meaning in the Bible is highly dependent on context. Phrases like "bowing down," "lying down" and "falling down" are defined primarily by "bowing," "lying" and "falling"; there is also a great difference between a person descending, the Lord sending fire from heaven and someone handling an object, to offer a few examples. In a very general sense, though, "down" indicates a lowering from more internal spiritual states to more external ones. That's why the journey is described as going "down" to Egypt from Canaan, and people from all quarters go "up" to Jerusalem. It's also why the Lord comes "down" to us, which generally indicates a state of judgment.

3216. So that an even better knowledge may be had of the nature of representatives in the next life, that is to say, of the things that are seen in the world of spirits, let several examples also be given. When with angels a discussion is taking place about matters of doctrine regarding charity and faith, there is sometimes seen in that lower sphere where the corresponding community of spirits is situated the visible idea of a city or of cities with palaces in them. The architecture of these is so astounding that you would say architectural art itself existed there and was the inspiration of everything there. In addition the houses there are of varying appearance. And the marvel of it is that in every single palace or house not even the smallest point or tiniest visible detail exists that does not represent some aspect of the idea and discussion among the angels. From this it becomes clear how countless the details are which they contain, and also what was meant in the Word by the cities seen by prophets - what is meant by the Holy City or New Jerusalem, and also by the cities mentioned in the prophetical part of the Word, namely matters of doctrine regarding charity and faith, 402, 2449.