Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Something that serves as strong evidence or irrefutable proof, especially of legal liability or criminal guilt.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun idiomatic Evidence, particularly of a crime, that is difficult or impossible to dispute.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun indisputable evidence (especially of a crime)

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

smoking +‎ gun

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