📚 A tough nut to crack, phrase. ❓ Definition (informal): A difficult problem or an opponent that is hard to beat. ❗️ Examples: 1. He should prove a tough nut to crack over tomorrow's extended three miles. 2. Japan has proved a tough nut for Microsoft's console division to crack. 3. Nine-year-olds are tough nuts to crack, as Peter Loraine, head of marketing at S Club Juniors' label Polydor, points out. 4. Now they, like the rest of Europe, are tough nuts to crack. 5. Upgrading a module that combines PHP with SQL is a tougher nut to crack, and it seems as though the XOOPS people have done an admirable job. ━━━━━━━━━━━━━ 🌀 @cambridge_dic