Law enforcement officials described the case as an extremely grave breach of national security.

The conventions describe violations of that section as a "grave breach," meaning they would be designated a war crime.

He told the court that there appeared to have been a grave breach of non-disclosure of evidence by the state.

When grave breaches of the convention occur, we raise them frequently, and directly, with the Israelis.

And, as in the cold war, it would not take much for simmering tensions to become a grave breach, even a violent one.

The most serious crimes are termed grave breaches, and provide a legal definition of a war crime.

The former were such crimes as treason or grave breaches of the peace.

Judge Grant furnished the language that found "a grave breach of judicial decorum".

A bad move - and a grave breach of etiquette.

Their presence aboard and the reasons he'd brought them was a grave breach of the normal rules of business.