What term describes the principle preventing someone from asserting a right detrimental to another party once a right has been waived?

The principle that describes the prevention of asserting a right detrimental to another party after that right has been waived is known as estoppel. This legal doctrine ensures that a person cannot contradict or deny something that has been established as a fact in a previous situation or has been agreed upon, especially if doing so would harm another party who relied on the initial waiver.

Estoppel serves to maintain fairness and justice in legal proceedings by preventing a party from changing their position when it would be unjust to allow them to do so, particularly when another party has relied on their original representation. It protects parties from inconsistencies and upholds the integrity of agreements.

In contrast, abandonment refers to the relinquishment of a right or interest, but doesn't necessarily operate in relation to the detrimental effect on another party. Foreclosure is a term specifically related to the legal process of terminating a mortgagor's interest in a property due to default on payments and does not address the waiver of rights generally. Noncompliance relates to failing to act according to a specific rule or agreement and does not encapsulate the protective intent found in the concept of estoppel.