in the tank

Prepositional phrase

US followed by for idiomatic usually informal slang

Japanese Meaning

（米国政治の文脈で、通常 'for' の後に続く形で使われる）支持的で好意的な態度を示す / （口語的・非公式に）衰退中、失敗状態、または長期間にわたる不調を示す

The senator's aides made it clear they were in the tank for the governor during the budget negotiations.

上院議員の補佐官たちは、予算交渉の間、明らかに知事を支持していることを表明した。

Sense（1）

(US, politics, idiomatic, usually followed by for) Supportive, approving, favorably disposed.

Sense（2）

(idiomatic, informal) In a state of decline, failure, or prolonged poor performance.

Sense（3）

(poker, slang) Contemplating a decision for a long time.

He went in the tank after his opponent put him all in.