heavy artillery

guns and howitzers of large caliber.
guns and howitzers of 155-mm caliber and larger. Compare light artillery ( def 2 ), medium artillery.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang Dictionary

heavy artillery definition

  1. n.
    powerful or persuasive persons or things. (The same as big gun.) : Finally, the mayor brought out the heavy artillery and quieted things down.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Heavy artillery is becoming an increasingly important factor in deciding
Some told harrowing tales of their confinement for weeks under heavy artillery
Compared with a tank or heavy artillery, they represent a tiny and easily
  hidden target.
All the heavy artillery of conservatism was there, and the participants were
  speaking to their own.
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