Hair-of-the-dog definitions

(idiomatic) An alcoholic drink taken the morning after to cure a hangover or withdrawal symptoms.

Origin of hair-of-the-dog

The principle of “curing like with like” has existed in various cultures historically; see hair of the dog at Wikipedia for details; the use of the phrase “hair of the dog” for a hangover cure dates to antiquity, an early form being found in the Ugaritic text KTU 1.1114 line 29, where the chief god of the pantheon, 'i/el, takes some for his health. The usage is in turn a borrowing from Akkadian.