smoking gun

1. N-COUNT A smoking gun is a piece of evidence that proves that something is true or that someone is responsible for a crime. 確鑿的證據(jù); 確證證據(jù)[美國英語] [usu sing]

The search for other kinds of evidence tying him to trafficking has not produced a smoking gun. 在其它方面還沒有找到能證明他參與此非法交易的確鑿證據(jù)。