rock the boat
To disturb the balance or routine of a situation

[TahlilGaran] Dictionary of Contemporary English ▲

rock the boat
[informal]
to do or say something that causes problems, especially if you try to change a situation which most people do not want to change.
We certainly don't want anyone rocking the boat just before the election.

I tried to suggest a few ways in which we might improve our image and was told very firmly not to rock the boat.

[TahlilGaran] English Idioms Dictionary ▲

rock the boat
to upset the way things are
The woman is a very quiet worker and never likes to rock the boat at work.

[TahlilGaran] English Idioms Dictionary ▲

rock the boat
v. phr., informal To make trouble and risk losing or upsetting something; cause a disturbance that may spoil a plan.
The other boys said that Henry was rocking the boat by wanting to let girls into their club.
Politicians don't like to rock the boat around election time.
Compare: UPSET THE APPLE CART.
Antonym: LET WELL ENOUGH ALONE.

[TahlilGaran] English Idioms Dictionary ▲