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.

4160. 'Let there not be any anger in my lord's eyes, for I cannot rise up before you', means that they are unable to be revealed. This too becomes clear from the train of thought in the internal sense, and is consequently clear without any further explanation. For 'rising up' would amount to an uncovering, and consequently a revealing, of the truths which are meant by 'the teraphim'. So 'being unable to rise up' means that they were unable to be revealed.