[tank] n [Pg tanque, alter. of estanque, fr. estancar to stanch, perh. fr. (assumed) VL stanticare--more at stanch] (ca. 1616) 1 dial: pond, pool; esp: one built as a water supply
2: a usu. large receptacle for holding, transporting, or storing liquids (as water or fuel)
3: an enclosed heavily armed and armored combat vehicle that moves on tracks
4: a prison cell or enclosure used esp. for receiving prisoners
5: tank top -- tank.ful n -- tank.like adj
[2]tank vt (1863) 1: to place, store, or treat in a tank
2: to make no effort to win: lose intentionally "~ed the match" ~ vi: to lose intentionally: give up in competition