/məˈtɪəriəl briːtʃ/ – Phrase
Definition: Vi phạm quan trọng.
A more thorough explanation: a violation serious enough to change the nature of the agreement and give the non-breaching party the right to withdraw from the contract and/or bring an action for damages
Example: If there is a material breach by either party there should be a right for the injured party to terminate the contract.