n (context|Australian and Indian English) A reservoir or dam.
n (context|Southwestern US|especially|_|Texas) A large metal container, usually placed near a wind-driven water pump, in an animal pen or field. By extension a small pond for the same purpose.
n (slang) A very muscular and physically imposing person. Somebody who is built like a tank.
n (gaming|video games|online games) In online and offline role-playing games, a character designed primarily around damage absorption and holding the attention of the enemy with offensive power as a close secondary consideration.
v (video games) To attract the attacks of an enemy target in cooperative team-based combat, so that one's teammates can defeat the enemy in question more efficiently.