be in bed with
US /bi ɪn bɛd wɪð/
UK /bi ɪn bɛd wɪð/

1.
和...有染, 和...同居
to be having a sexual relationship with someone
:
•
Rumor has it that he's in bed with his secretary.
有传言说他和秘书有染。
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They've been in bed with each other for months.
他们已经同居好几个月了。
2.
与...勾结, 与...暗中合作
to be closely involved or secretly cooperating with someone, especially in a dishonest or unethical way
:
•
The politician was accused of being in bed with big corporations.
这位政客被指控与大公司勾结。
•
Many believe the regulatory body is in bed with the industry it's supposed to oversee.
许多人认为监管机构与其应该监督的行业勾结。