When one party defaults under a contract, the other party is known as the?

In the context of contract law, when one party defaults or breaches the terms of a contract, the other party is referred to as the injured party. This is because they have suffered a loss or detriment as a result of the defaulting party's actions. The injured party retains the right to seek remedies or compensation for the harm caused by the breach.

In a contractual relationship, the terminology is important for understanding the roles and responsibilities of the parties involved. The injured party seeks to enforce the agreement or obtain damages, which is central to how the legal system addresses contract disputes.

Other options do not accurately describe this role; for example, the breaching party is the one who has failed to uphold their contractual obligations, while the other terms do not specifically capture the notion of having suffered a loss due to another's failure to perform.