Heavy-artillery
noun
1.
guns and howitzers of large caliber.
2.
guns and howitzers of 155-mm caliber and larger.
Compare (def 2), .
noun phrase
The most impressive and persuasive arguments, evidence, persons, etc, available: The Republicans are rolling out their heaviest artillery for this debate/ Against these big critics’ big guns I offered the author some shelter (first form 1809+)
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