hair of the dog

The phrase "hair of the dog" is commonly used to refer to a remedy for a hangover, typically suggesting that consuming a small amount of alcohol the morning after heavy drinking can alleviate the symptoms. It originates from the belief in folk medicine that using a hair from the dog that bit you would help to prevent rabies. In the context of a hangover, it implies that consuming a small dose of the same alcoholic beverage that caused the hangover can alleviate its effects temporarily.