Estopping, a legal term meaning to prevent or forbid someone from denying or asserting something, is often used in legal proceedings and contracts. There are several synonyms for this word that can be used to convey the same meaning. These include blocking, hindering, impeding, obstructing, thwarting, and prohibiting. Each of these words emphasizes the action of preventing someone from denying or asserting something, but they differ in their exact connotations and areas of application. Regardless of the synonym used, the underlying concept of estopping remains the same: preventing someone from taking an action that would otherwise be permissible.