1. A person who sharpens tools, knives, or blades professionally
The knife sharpener came to the market every week.
O afiador vinha ao mercado toda semana.
2. A device or tool used for sharpening blades or cutting implements
I use a manual sharpener for my kitchen knives.
Uso um afiador manual para minhas facas de cozinha.
3. Something that sharpens or makes more acute (figurative)
Debate is a sharpener of critical thinking.
O debate é um afiador do pensamento crítico.