eyewitness

Someone who sees an event and can report or testify about it. [from 16th c.]

Japanese Meaning

目撃者

The eyewitness provided a detailed account of what happened that night.

その目撃者はその夜に起きたことについて詳しく証言した。

Sense（1）

Someone who sees an event and can report or testify about it. [from 16th c.]

And the girl's fate he could picture as plainly as though he were an eyewitness to it.

eyewitnesses

（ plural ）