Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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).

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

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

  • n. indisputable evidence (especially of a crime)

Etymologies

smoking +‎ gun (Wiktionary)

Examples

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