go all the way with someone—
1. be in complete agreement with a person:
- I agree with much of what you say, but I cannot go all the way with you.
2. (euph.) have sex with a person (as distinguished from other forms of caressing):
- Dave had lain awake running through endless fantasies of going all the way with her.
go half way with someone—(also: meet someone half way) make concessions to smb.; come to a compromise with a person:
- Maybe you can convince your parents to go halfway with you, as part of your birthday gift from them.
Note: The expression does not correlate in meaning with the phrase go halves with someone—divide the cost of smth., etc. with another person:
- A good idea, if a lot of the books you need are pricey, is to go halves with a friend.