cometido um erro

committed an error; made a mistake

→ cometer
phrase Rare #30,473
committed an error; made a mistake This is the past participle phrase as used in perfect or passive constructions. It sounds a bit more formal than simply saying "errei". It is commonly used in expressions like "ter cometido um erro" or "ser cometido um erro".
PO: Talvez eu tenha cometido um erro.
EN: Maybe I made a mistake.

Eu senti que eu havia cometido um erro.

I felt that I had made a mistake.

— As Invasões Bárbaras (2003)

Foi cometido um erro.

A mistake was made.

A partir daquele momento, tinha certeza de que havia cometido um erro grave.

From that moment on, I was certain that I had made a serious mistake.

Fadil sentiu que tinha cometido um erro contratando Layla.

Fadil felt he had made a mistake hiring Layla.

Talvez eu tenha cometido um erro.

Perhaps I made a mistake.

Tom não conseguiu convencer a Mary de que ela tinha cometido um erro.

Tom couldn't convince Mary that she had made a mistake.

Tom descobriu que havia cometido um erro.

Tom discovered that he had made a mistake.

Tom reconheceu que havia cometido um erro.

Tom admitted that he had made a mistake.