You refer to two things or people as bedfellows when they have become associated or related in some way.
例句
It's possible to be bedfellows with someone on one issue, and at odds with them on another...可能在一个问题上与某人情投意合，在另一个问题上又意见相左。Sex and death are strange bedfellows.性爱和死亡奇怪地纠结在一起。