Definition of "smoking gun" []

• Informal Something that serves as indisputable evidence or proof, especially of a crime: "There is no smoking gun or paper trail to [the CIA]” ( Thomas Polgar). (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Ritter-Saddam footsie game smoking gun as mushroom cloud, xix"
• "Murdock, Deroy, on waterboarding as source of pride mushroom cloud, smoking gun as mustard gas"