WordNet
Wikipedia
Gag rule
A gag rule is a rule that limits or forbids the raising, consideration, or discussion of a particular topic by members of a legislative or decision-making body.
Usage examples of "gag rule".
When I braced the governor, she fed me a steaming dish of moose turds, raisined with hints about awful things rampaging through the galaxy, and ended by slapping a house arrest on me and a gag rule on Lis.