To sharpen a pencil or a knife.
Please, my dear fellow, will you sharpen my saber for me?
20: "All the Israelites went down to the Philistines to sharpen every man his share and his coulter."
To sharpen the blade, hold the handle in the right hand.
Competition is helpful to sharpen your skills.
Even if you are very creative, you need to hone and sharpen your skills.