A piece of incontrovertible incriminating evidence.
- 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.
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Syllabification: smok·ing gun
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