been mistaken, been wrong
Ich habe mich irgendwo geirrt.
I must have made a mistake somewhere.
Sie haben sich in bezug auf uns geirrt.
You were wrong about us.
Ihr habt euch in bezug auf uns geirrt.
You were wrong about us.
I was mistaken.
I must have been mistaken.
You weren't mistaken.
Wir haben uns geirrt, Kien.
We were mistaken, Kien.
— Die Samurai der Moderne - Die dunkle Seite (2004)
You were probably mistaken.