violate a contract
violate an agreement

Again, the Russians had violated their own agreement to give him seven days.

And don't get any bright ideas about violating our agreement.

Both sides soon accused the other of violating the agreement.

The next team to violate the agreement will be fined $500,000.

He violated the agreement, setting off civil war in Sweden.

He also said she had violated an agreement regarding the opening of party offices.

If the company loses money in the second quarter, it will again violate its agreement.

Federal prosecutors said he had violated his agreement with them by continuing to use drugs himself.

But in other cases, say critics, the department is violating agreements because it failed to ask for enough money to get the job done.

And they might be accused of violating the agreement that produced the 1986 tax reform.