A scold's bridle, sometimes called a witch's bridle, a gossip's bridle, a brank's bridle, or simply branks,[1] was an instrument of punishment, as a form of public humiliation.[2] It was an iron muzzle in an iron framework that enclosed the head (although some bridles were masks that depicted suffering). A bridle-bit (or curb-plate), about 5 cm × 2.5 cm (2 in × 1 in) in size, was slid into the mouth and pressed down on top of the tongue, often with a spike on the tongue, as a compress. It functioned to silence the wearer from speaking entirely, to prevent the women from nagging. The scold's bridle was used on women.[3] This prevented speaking and resulted in many unpleasant side effects for the wearer, including excessive salivation and fatigue in the mouth.

https://en.wikipedia.org/wiki/Scold's_bridle