"sin tax." YourDictionary, n.d. Web. 15 October 2018. <http://www.yourdictionary.com/sin-tax>.
sin tax. (n.d.). Retrieved October 15th, 2018, from http://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.