To sharpen an object when you are dreaming, can be interpreted as the need of the flexibility of the dreamer’s mind. Sharpening of something in the dream is like sharpening of the mind in the life. It means that you need to be better in what you’re doing or thinking. Alternatively, the dream about sharpening represents the lack of the dreamer’s quality to adapt to the requests of others. Maybe you are a little bit to egoistic. You should consider of the overall picture of your dream. Think what will be best interest for you and for others, than just thinking about your needs.