"break the convention" is correct and usable in written English.
You can use it in any situation in which someone wants to do something that is not generally accepted or expected. For example: "John wanted to break the convention by starting his own business instead of taking over his father's."
The first woman to break the convention and make a mark in Indian journalism was the legendary photojournalist Homai Vyarawalla, who died last year.
It will not publish the attorney general's advice to Cameron in full because it does not want to break the convention about government legal advice being confidential.
The organisation said that such a large importation for personal use might break the Convention on International Trade in Endangered Species of wild flora and fauna (Cites).
That appeared to break the convention, established since the Bank of England was given independence in 1997, that politicians refrain from commenting on the direction of monetary policy.
The government believes the first three motions, including a "fatal" one to be tabled by the Liberal Democrats, would break the convention that peers do not block financial measures.
Sun executives are said to be pleased to "break the convention" that the Queen has no views and are not unduly concerned about the sanctions likely to be introduced by Ipso.
Addie and Louis break the conventions of the fictional small town of Holt and spend their nights together.
As untraditional as the affair might seem, the men were actually following a long tradition of Americans coming here to break the conventions of the day, do something illegal, or simply live as they wished.
Snapchat is interesting in that they break the conventions of traditional fundraising, one source tells us.
In the small provincial community where they live, neither she nor Huus dares to break the conventions they know, sad as it all may be.
We want to honor beautiful bodies that break the conventions we encounter in magazines, on television, on billboards and just about everywhere else.
