We don't have any synonyms for roaring meg yet.
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Definition of roaring meg:
(n) :
(historical) A large cannon; specifically, the large 15th cannon at Edinburgh Castle (more usually called ‘Mons Meg’), or the cannon used to defend Londonderry during the siege of 1688-9.
(n) :
(figuratively, now rare) Any large or impressive thing.
(n) :
(obsolete) A kind of spinning top.