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

1.
parler à tort et à travers, parler hors de propos
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.
J'espère que je n'ai pas parlé à tort et à travers en mentionnant le nouveau projet.
•
He tends to speak out of turn, which often gets him into trouble.
Il a tendance à parler à tort et à travers, ce qui lui attire souvent des ennuis.