A rule for limiting or ending debate in a deliberative body WordNet 3.0 & Open English WordNet

Cloture, closure or, informally, a guillotine, is a motion or process in parliamentary procedure aimed at bringing debate to a quick end. Wikipedia

In United States history, the gag rule was a series of rules that forbade the raising, consideration, or discussion of slavery in the U.S. House of Representatives from 1836 to 1844. Wikipedia

Parliamentary procedure forcing a quick end to a debate Wikidata

A motion or process aimed at bringing debate to a quick end in a parliamentary procedure. OmegaWiki

A method of ending a parliamentary debate and securing an immediate vote upon a measure before a legislative body. Wiktionary

In legislative assemblies that permit unlimited debate (that is, a filibuster): a motion, procedure or rule by which debate is ended so that a vote may be taken on the matter. For example, in the United States Senate, a three-fifths majority vote of the body is required to invoke cloture and terminate debate. Wiktionary

A motion, procedure or rule by which debate is ended so that a vote may be taken on the matter. Wiktionary (translation)

A rule that limits or forbids the consideration or discussion of a particular topic by members of a legislative or decision-making body. Wiktionary