(Australian and Indian English) A reservoir or dam.
(Southwestern US, chiefly Texas) A large metal container, usually placed near a wind-driven water pump, in an animal pen or field.
(Southwestern US, chiefly Texas) By extension a small pond for the same purpose.
(slang) A very muscular and physically imposing person. Somebody who is built like a tank.
(video game) a unit or character designed primarily around damage absorption and holding the attention of the enemy (as opposed to dealing damage, healing, or other tasks)
(video game) 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.