material breach

[Rihanna]

a breach serious enough to destroy the value of the contract and to give a basis for an action for breach of contract

[IsobelHaups]

A material breach is a contract term referring to a serious violation or misconduct by one party that results in significant damage to the other party, negating the contracts purpose and relieving the injured party of its obligation to perform under the contract. Essentially, its a breach so substantial that it disrupts the foundation of the agreement.