Sharpen a knife - you should watch.
If in a dream you had a chance to sharpen something, it means that you will have earnings and profits, the source of which will become your skilled hands. Sharpen a pencil - for people whose profession or hobby is art, especially literature, this dream foretells notable successes in their chosen field. Seeing someone sharpening a knife - the dream means that you will hang over the threat from enemies.
To sharpen an object in your dream, suggests that you need to flexible in your thinking. Sometimes you need to adapt or yield to the requests of others. Consider the overall picture instead of just thinking about yourself.