- tank [taŋk]n.[ TANK sense 1 < Gujarati tānkh; other senses < or infl. by Sp & Port tanque, aphetic < estanque, a pool, stoppage of flow < estancar, to stop the flow of < VL * stanticare, to STAUNCH]1. Archaic in India, a natural or artificial pool or pond used for water storage2. any large container for liquid or gas [a gasoline tank, a swimming tank]3. short for:a) TANK TOPb) TANK SUIT4. [name orig. used for purpose of secrecy during manufacture] a heavily armored, self-propelled combat vehicle armed with guns and moving on full tractor treads☆ 5. Slang a jail cell, esp. one for new prisoners charged with misdemeanorsvt.1. to put, store, or process in a tank2. Slang to lose (a game, match, etc.) deliberately or due to a lack of effortvi.Slang1. to fail or go into a sharp decline2. to lose, esp. as a result of a lack of effort——————☆ go in the tank☆ Slang to lose or fail badly or on purpose——————tank up Informal1. to supply with or get a full tank of fuel☆ 2. to drink much liquor
English World dictionary. V. Neufeldt. 2014.