A "hair of the dog drink" is an alcoholic beverage consumed to alleviate the symptoms of a hangover. Its name derives from the folk belief that ingesting a small amount of the same alcohol that caused the hangover can mitigate its effects.
The practice of consuming a hair of the dog drink has been documented for centuries. Ancient Egyptians and Greeks believed that drinking leftover wine could cure hangovers. Today, many people swear by the effectiveness of this remedy.