violate a contract
violate an agreement

However, doing so violates my contract, and this is probably true of most industry devs.

It turned out that by crossing the state line, he had violated his contract with Payless.

The restructuring violated the teachers union's contract, and some teachers want the changes changed back.

She said my mother had violated their contract by even telling me she'd come to this clinic.

I'll be violating my contract if they see me buying anything more from you.

The court order came at the request of school bus companies, which argued that the city's plan violated their contract.

"How was she going to get away with violating her contract?"

But he denied that his medical center had violated its contract "in any material way."

But the union says that American is violating their contract, which requires all flying at the airline to be done by its members.

When I left him, he threatened to violate my contract.