in bed with

figuratively

Sharing one's bed with. / (figuratively) Engaging in a close mutually beneficial relationship, especially secretly and illicitly.

Japanese Meaning

実際に同じベッドで一緒に寝ること、つまり一緒に寝ることを指す / 比喩的に用いられる場合、密かにかつ不正に親密で互恵的な関係にあることを意味する

After the power outage, the children were all in bed with their parents to stay warm.

停電の後、子どもたちは暖を取るためにみんな親と同じベッドで寝ていた。

Sense（1）

Sharing one's bed with.

People also ask me what was it like being in bed with Sean Connery. I said, ‘Fine.’

Sense（2）

(figuratively) Engaging in a close mutually beneficial relationship, especially secretly and illicitly.

He's not for the company; he's in bed with the investment bankers.