afilar
/afiˈlaɾ/ · B2 · verb
to sharpen
🔪 afilar = a- + filo (edge): put an edge on it, so sharpen
Afilar comes from filo, meaning blade edge. Giving something an edge is sharpening it. The slang senses (court, flirt, have sex) are figurative extensions of honing or working something up, mostly in colloquial Latin American use.