совершили ошибку

made a mistake

→ совершить
phrase Rare #34,239
made a mistake Used with plural subjects or as the formal/polite form of “you made a mistake.” Literally, it means “committed a mistake,” but the natural English equivalent is “made a mistake.”
RU: Мы совершили ошибку, доверившись ему.
EN: We made a mistake by trusting him.

Том и Мэри признали, что совершили ошибку.

Tom and Mary admitted that they had made a mistake.

Возможно, Вы совершили ошибку.

You may have made a mistake.

Вы признали, что совершили ошибку.

You admitted that you made a mistake.