Witness
noun
An evidence person is a witness, because witnesses are people who provide evidence (you know, with their mouths or something).
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
証人の場合
in the case of a witness
証人の出頭
the appearance of a witness
証人の証言
a witness's testimony
成人の証人
an adult witness
他の証人
another witness
エホバの証人
Jehovah's Witnesses
証人に立つ
to stand as witness, to bear testimony
証人にする
to make into a witness
証人になる
to become a witness
証人が、ビエトが有ざいであることを証明してくれました。
The witness proved that Viet was guilty.
私の夫のさいばんでは、夫の口座がある銀行の行員の人たちが証人として出ていしてくれました。
In my husband's court case, the clerks of the bank where he has his accounts appeared in court as witnesses for him.
証人として、遠回しに言わずに率直に君の質問に答えさせてもらうよ。ああ、あのフグが確かに君のプリンを食べていたね。
As a witness, I won’t beat around the bush, I’ll answer your question frankly. Yeah, that Fugu was absolutely eating your pudding.