まちがえた

made a mistake, got wrong

→ 間違える
まちがえ make a mistake, get wrong + past tense
verb · past indicative Rare #41,991
made a mistake, got wrong
JA: 答えをまちがえた。
EN: I got the answer wrong.
Conjugation of 間違える
Indicative past

あら家をまちがえた

Oh, I went to the wrong house.

— 鏡 (1975)

初めてに会った時僕は君ロイまちがえた

When I first met you, I mistook you for Roy.

彼女は私をタモリさんとまちがえた

She mistook me for Tamori.

私たちは道をまちがえたにちがいない

We must have taken the wrong road.