A piece of incontrovertible incriminating evidence.
More example sentences
- Yes, I think ultimately the White House is going to have to show some concrete evidence, a smoking gun.
- We knew from the Columbia Investigation there were likely to be few smoking guns; the evidence was mostly public testimony and clarified during various news conferences during and after the hearings.
- Each new revelation was the smoking gun that was going to end his presidency.
Definition of smoking gun in:
- The British & World English dictionary