What is the legal term used to prevent someone from reclaiming a right they have previously waived?

The correct term used to prevent someone from reclaiming a right they have previously waived is "estoppel." This legal doctrine serves to hold a party accountable for their previous actions or promises, thereby preventing them from denying the truth or reclaiming rights that they have effectively given up.

In the context of legal proceedings, estoppel is often applied when one party has taken action or made representations that another party has relied upon to their detriment. For example, if a property owner waives their right to enforce a particular rule and another person relies on that waiver, the property owner cannot later claim that right again; doing so would be inconsistent and potentially unjust.

Waiver, while related, specifically refers to the act of intentionally relinquishing a known right, but it does not carry the same legal weight as estoppel. Indemnity pertains to compensation for harm or loss, while liability is the state of being responsible for something, usually in a legal sense. These terms do not capture the specific situation of preventing reclamation of previously waived rights as estoppel does.