smoking gun 确凿证据
英文释义
(SLANG) Undeniable physical evidence that a crime or misdeed has been committed.
例句
We discovered that our accountant was stealing from us; the smoking gun was a security video of him secretly destroying important financial records after our office was closed.
我们发现会计在偷钱，确凿证据是安全摄像头记录到，在我们下班后，他在偷偷地销毁重要的财务数据。