Shrub (drink) in the context of "Cocktail"

A cocktail is a mixed drink, usually alcoholic. Most commonly, a cocktail is a combination of one or more spirits mixed with other ingredients, such as juices, flavored syrups, tonic water, shrubs, and bitters. Cocktails vary widely across regions of the world, and many websites publish both original recipes and their own interpretations of older and more famous cocktails.