It is common in the Bible for people to "rise up," and it would be easy to pass over the phrase as simply describing a physical action. But in fact it represents an elevation in spiritual state, moving to a more internal frame of mind closer to the Lord. Often it has to do with understanding a new or important idea; we "rise up" to a state of greater perception and enlightenment. Obviously context is crucial to the exact meaning of the phrase in a given passage -- it matters greatly who it is that is rising up, and why.

5655. 'We certainly came down at the beginning to buy food' means a mind set on acquiring good for truths. This is clear from the meaning of 'coming down' as a mind set on something, that is, an intention; for a person who goes down or betakes himself to any place does so from a set purpose, the purpose being in this case to acquire good for truths, meant by 'buying food'. For 'buying' means acquiring and making one's own, 5374, 5397, 5406, 5414, 5426, while 'food' means the good of truth, 5340, 5342, in this case good for truths which are represented by 'the sons of Jacob' who spoke these words regarding themselves.