| 1. | a large receptacle, container, or structure for holding a liquid or gas: tanks for storing oil. |
| 2. | a natural or artificial pool, pond, or lake. |
| 3. | Military. an armored, self-propelled combat vehicle, armed with cannon and machine guns and moving on a caterpillar tread. |
| 4. | Slang. a prison cell or enclosure for more than one occupant, as for prisoners awaiting a hearing. |
| 5. | tank top. |
| 6. | to put or store in a tank. |
| 7. | Slang. to do poorly or decline rapidly; fail: The movie tanked at the box office. |
| 8. | tank up,
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| 9. | 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. |

tank
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tank up
Fill a gas tank with fuel, as in As soon as we tank up the car we can leave. [First half of 1900s]
Drink to the point of intoxication. F. Scott Fitzgerald used this expression in The Great Gatsby (1926): "I think he'd tanked up a good deal at luncheon." This expression often is put in the passive, meaning "be or become intoxicated," as in My roommate really got tanked up last night. [Slang; c. 1900]