A usually artificial pool, pond, reservoir, or cistern, especially one used to hold water for drinking or for irrigation, An enclosed, heavily armored combat vehicle that is armed with cannon and machine guns and moves on continuous tracks, A pool of deep water, natural or artificial, A large basin or cistern; an artificial receptacle for liquids, verb_ treat in a tank, consume excessive amounts of alcohol, To deliberately lose a sports match with the intent of gaining a perceived future competitive advantage, intransitive verb_ To place, store, or process in a tank, Informal To suffer a sudden decline or failure