rock the boat
US /rɑk ðə boʊt/
UK /rɑk ðə boʊt/

1.
faire des vagues, créer des problèmes
to do or say something that causes problems, especially by upsetting people or by making changes to a situation that is currently stable
:
•
I don't want to rock the boat, but I think we need to address this issue.
Je ne veux pas faire de vagues, mais je pense que nous devons aborder cette question.
•
He's usually quiet and never rocks the boat at meetings.
Il est généralement calme et ne fait jamais de vagues lors des réunions.