speak out of turn
US /spiːk aʊt əv tɜːrn/
UK /spiːk aʊt əv tɜːrn/

1.
parlare a sproposito, dire qualcosa di inopportuno
to say something inappropriate or at the wrong time, especially something that should have been kept secret or that was not one's place to say
:
•
I hope I didn't speak out of turn when I mentioned the new project.
Spero di non aver parlato a sproposito quando ho menzionato il nuovo progetto.
•
He tends to speak out of turn, which often gets him into trouble.
Tende a parlare a sproposito, il che spesso lo mette nei guai.