Sharpen/ˈʃɑːrpən/ Definition 1 of 6Pro Tip 1/2Physical Objects Sharpen is often used when talking about making physical objects like knives or pencils pointier. I need to sharpen my knife to slice these tomatoes. Pro Tip 2/2Skill Improvement The term can also refer to practicing and improving skills, similar to how one sharpens a tool. You should sharpen your cooking skills.