tank

American  

[tangk] / tæŋk /

noun

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. (in a video game) a category of job classes in a role-playing game, best suited to withstand large amounts of damage from an enemy.

   The only decent tank in this game is Warrior, just because the cooldown period for the Paladin and Dark Knight skills is way too long.

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

6. tank top.

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verb (used with object)

1. to put or store in a tank.

2. (in a video game) to provoke and hold the attention of (an enemy character) so that it does not target other player characters in the party who are less able to withstand large amounts of damage.

   If you’re properly tanking this boss, you’ll never let him face your mages.

verb (used without object)

1. Slang. to do poorly or decline rapidly; fail.

   The movie tanked at the box office.

verb phrase

1. tank up

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

   2. Slang. to drink a great quantity of alcoholic beverage, especially to intoxication.

idioms

1. go in / into the tank, to go through the motions of a match but deliberately lose because of an illicit prearrangement or fix; throw a fight.

2. in the tank,

   1. failing, doing poorly, or declining.

      His grades were in the tank last quarter.

   2. favoring, colluding, or assisting in a partisan way (often followed by with orfor ).

      The talk-show host was in the tank with the Green Party.

tank British  

/ tæŋk /

noun

1. a large container or reservoir for the storage of liquids or gases

   tanks for storing oil

2. 1. an armoured combat vehicle moving on tracks and armed with guns, etc, originally developed in World War I

   2. ( as modifier )

      a tank commander

      a tank brigade

3. dialect a reservoir, lake, or pond

4. photog

   1. a light-tight container inside which a film can be processed in daylight, the solutions and rinsing waters being poured in and out without light entering

   2. any large dish or container used for processing a number of strips or sheets of film

5. slang

   1. a jail

   2. a jail cell

6. Also called: tankful.  the quantity contained in a tank

7. a dam formed by excavation

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verb

1. (tr) to put or keep in a tank

2. (intr) to move like a tank, esp heavily and rapidly

3. slang to defeat heavily

4. informal (intr) to fail, esp commercially

tank More Idioms  

More idioms and phrases containing tank

• think tank

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Other Word Forms

• tankless adjective
• tanklike adjective

Etymology

Origin of tank

First recorded in 1610–20; perhaps jointly from Gujarati tānkh “reservoir, lake,” and Portuguese tanque, shortening of estanque “pond,” literally, “something dammed up,” derivative of estancar, from Vulgar Latin stanticāre (unattested) “to dam up, weaken”; adopted as a cover name for the military vehicle during the early stages of its manufacture in England (December 1915)

Explanation

A tank is a large container for gases or liquids, like a tank of oil. Another kind of tank is an armored military vehicle with a cannon. If you see that kind of tank driving down the road, run for cover! There are two main kinds of tanks. One kind is a container for water, oil, natural gas, or other liquids and gases. Some houses have fuel oil tanks outside or in the basement. The other kind of tank is a large powerful military vehicle. A tank — which has a cannon — rolls across the ground on treads and is heavily armored. Those tanks can roll right over cars and anything else they want to squish.

Example Sentences

“The sectors hit hardest by U.S. and Israeli airstrikes represent the core pillars of employment and production,” Kahalzadeh wrote for the London-based Bourse & Bazaar Foundation think tank.

From The Wall Street Journal • Apr. 16, 2026

It also requires case-by-case analysis when determining which buildings have military significance, said Yuval Shany, a legal expert from the Israel Democracy Institute think tank.

From BBC • Apr. 16, 2026

Although he saved his home and work studio, he said he lost a power washer, an emergency backup generator, a water tank and a log splitter gifted by his father, who died in 2017.

From Los Angeles Times • Apr. 15, 2026

Since leaving the central bank in 2011, Warsh has, among other things, served as a lecturer at Stanford University’s business school and as a visiting fellow at the university’s Hoover Institution, a conservative think tank.

From MarketWatch • Apr. 14, 2026

And why did the molasses company have to put such a big tank right here?

From "I Survived the Great Molasses Flood, 1919" by Lauren Tarshis

Related Words

• pond
• pool
• reservoir