https://www.merriam-webster.com/dictionary/hair%20of%20the%20dog%20that%20bit%20you
HAIR OF THE DOG THAT BIT YOU Definition & Meaning - Merriam-Webster
The meaning of HAIR OF THE DOG (THAT BIT YOU) is an alcoholic drink that is taken by someone to feel better after having drunk too much at an earlier time.
hair of the dog that bit you