get into bed with someone —(also: jump into bed with someone)
1. (euph.) have sex with a person:
- Most of the time they just want to get into bed with someone as soon as possible.
2. become closely involved with a person or group:
- They got into bed with Peugeot precisely because they have superior design expertise.
go to bed with someone — = get into bed with someone 1:
- I didn’t want to go to bed with him, but I wanted him to know how much I loved and appreciated him.