The term 'sharpen' can be defined as making something sharper or more intense. This can be done in a variety of ways, such as intensifying (9 letters), abrading (6 letters), increasing (8 letters), grinding (5 letters), improving (7 letters), edging (4 letters), stropping (5 letters), whetting (4 letters), honing (4 letters), and focusing (5 letters). All of these words refer to different methods of sharpening an object, such as grinding it against a surface, honing it with a whetstone, or stropping it with a leather belt.