a large receptacle, container, or structure for holding a liquid or gas

tanks for storing oil.

a natural or artificial pool, pond, or lake.

Military . an armored, self-propelled combat vehicle, armed with cannon and machine guns and moving on a caterpillar tread.

Slang . a prison cell or enclosure for more than one occupant, as for prisoners awaiting a hearing.

tank top.

to put or store in a tank.

Slang . to do poorly or decline rapidly; fail

The movie tanked at the box office.

tank up,

to fill the gas tank of an automobile or other motor vehicle.

Slang . to drink a great quantity of alcoholic beverage, esp. to intoxication. ?

go in the tank

Boxing Slang . to go through the motions of a match but deliberately lose because of an illicit prearrangement or fix; throw a fight.

noun

aquarium , basin , cauldron , cistern , container , jail , pond , pool , receptacle , reservoir , vat , vehicle , weapon