1. to make or become sharp or sharper
2. to make more intense, focused, or effective

Examples

• She used a stone to sharpen her knife.
• The pencil sharpener broke yesterday.
• Cold weather sharpened his appetite.
• The debate sharpened the differences between the candidates.
• He needs to sharpen his math skills before the test.
• The image became sharper when I adjusted the focus.
• Years of practice sharpened her reflexes.