In legal terminology, "quash" primarily means what?

The term "quash" in legal terminology primarily refers to the action of setting aside a legal decision, order, or document as void. This can occur in various legal contexts, such as quashing a subpoena or a court order, where the legal authority recognizes that the original decision is invalid or no longer applicable. By quashing a ruling, the court effectively nullifies its effect, which can serve to protect rights or correct judicial errors.

In contrast, the other options do not capture the essence of what "quash" means in a legal framework. For example, affirming refers to the confirmation of a previous decision, enforcing pertains to ensuring compliance with a law or order, and extending a lease relates to prolonging the period of a rental agreement. None of these definitions align with the concept of declaring something as void, which is the core meaning of "quash."