be with
- to understand a person’s line of thought
- to physically accompany
- to have sexual intercourse with
Wiktionary
verb
- To have sex with.
“We dated for almost a year, but I've never been with him.”
- To date or be boyfriend/girlfriend with.
“I've been with her for almost a year now.”
- To agree with someone.
“I came in here disagreeing, but I've changed my mind, and now I'm with you on this.”
- To understand someone's point or intention.
“I'm sorry; I'm not with you on this point.”
- To be down with (something); believe in, like, or espouse.
“You know I ain't with using drugs.”
“You like robbing banks? Nah, I ain't with that.”