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人違いだ

wrong person; you have mistaken me for someone else

→ 人違い
phrase Rare #23,924
wrong person; you have mistaken me for someone else Used to say that someone has mistaken one person for another. 人違いだ is the plain form; 人違いです is the polite form. 人違いだった is the past form.
JA: すみません、人違いだと思います。
EN: Sorry, I think you have mistaken me for someone else.

人違いだよ

You've mistaken me for someone else.

— マレーナ (2000)

でも人違いだ

But you’ve got the wrong person.

— グッバイ、レーニン！ (2003)

人違いだ

You've got the wrong person.

— フィフス・エレメント (1997)

人違いだと思います。

I think you have me confused with someone else.

こっちだと思ったが人違いだ

I thought it was you, but I mistook you for someone else.

— 自転車泥棒 (1948)

私は人違いだと言って逃げたわ

I told them they had the wrong person and ran away.

— セントラル・ステーション (1998)

人違いだ。

You've got the wrong person.