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Definition of Roaring Meg
1. Noun. A large cannon; specifically, the large 15th cannon at (w Edinburgh Castle) (more usually called ‘Mons Meg’), or the cannon used to defend Londonderry during the siege of 1688-9. ¹
2. Noun. (context: figuratively now rare) Any large or impressive thing. ¹
3. Noun. (obsolete) A kind of spinning top. ¹
¹ Source: wiktionary.com