Meaning: To Grow In Spirituality
The Crown chakra has to do with wisdom and being one with the world. When this chakra is open, you are open-minded and strongly aware of the world and yourself.
When it is underactive, you are not particularly aware of spirituality. You are probably quite rigid in your thinking.
If this chakra is overactive, you probably intellectualize things too much. You might be addicted to spirituality, and you might ignore your physical need.