(idiomatic, US, politics, often followed by for or with) Supportive, approving, favorably disposed.
(idiomatic, informal) In a state of decline, failure, or prolonged poor performance.
(idiomatic) In reserve; available for future use.
(poker, slang) Contemplating a decision for a long time.
He went in the tank after his opponent put him all in.
When you're public, you're at the mercy of the markets. You can be doing extremely well, but if the markets are in the tank or your industry is in the tank, you don't get rewarded for it. Tilman J. Fertitta
An orca trainer almost drowned after its orca dragged him down in the tank. He did reveal the locations of three Al-Qaeda hideouts. Amy Poehler
I've talked to so many people, men and women alike, that get overweight and their self-esteem just goes in the tank. They think they're judged. They think they're unattractive. Phil McGraw
I still believe Emmitt has enough left in the tank to be a productive back over the next couple of seasons. Al Michaels