Other forms: tanks; tanked; tanking
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.