smoking gun

Noun

idiomatic

(idiomatic) Evidence, particularly of a crime, that is difficult or impossible to dispute.

Japanese Meaning

決定的な証拠、特に犯罪に関する、否応なく認めざるを得ない証拠

During the trial, the leaked emails acted as the smoking gun that shifted public opinion.

公判中に流出した電子メールが世論を変えた決定的な証拠となった。

Sense（1）

(idiomatic) Evidence, particularly of a crime, that is difficult or impossible to dispute.

We have a theory, but we haven't found a smoking gun yet.

smoking guns

（ plural ）