Sin tax. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/sin-tax
(plural sin taxes)
(idiomatic, politics) A government-imposed tax on a specific good, service, or activity which is legal but widely considered to be unwholesome or socially harmful, such as a tax on alcoholic beverages, tobacco products, or gambling.
English Wiktionary. Available under CC-BY-SA license.