noun
plural tanks
[count] a container for holding a liquid or gas
the amount that a tank will hold
a military vehicle that moves on two large metal belts with wheels inside them and that is covered in heavy armor
in/into the tank
US informal :in or into a very bad state or condition
verb
tanks; tanked; tanking
US informal
[no obj] :to be very unsuccessful :to fail completely
to make no effort to win a contest (such as a tennis match) :to deliberately lose a game, match, etc. [+ obj]
tank up
[phrasal verb] US informal :to fill a vehicle with fuel
US