Definition of smoking gun in English:

smoking gun

Syllabification: smok·ing gun

noun

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.

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Word of the day grammarian
Pronunciation: grəˈme(ə)rēən
noun
a person who studies and writes about grammar