get with (someone or something)

1. To be knowledgeable about and engaged with something. The boss is going to want us to know exact figures in the meeting, so you better get with it. You really need to get with the times, Dad. People just don't talk that way anymore! You've never heard of her? Geez, Grandpa, get with it—she's only a super famous singer!

2. slang To have a romantic or flirtatious interaction with someone. A: "Is it true that you got with Katie over the summer?" B: "Yeah, we've been on a few dates so far." I'm so happy to hear that you finally got with Sophia! I've been wanting you guys to go out for years! My boyfriend is really insecure. I don't think he believes me when I say I didn't get with any boys over winter break.

3. slang To have sex with someone. I wouldn't be surprised if he got with her last night after the party—they were very flirty all night. He's not a long-term relationship-type of guy. He clearly just wants to get with you. You will never get with Jenna, dude. She's way too good for you, and has, like, standards.

4. To meet with someone or some group, especially in order to accomplish some specific task. I want you to get with our lawyers right away and see what needs to be done. I hope this is an error. Can you get with the head of Legal and find out what happened? If we're ever gonna finish this project, we need to get with the other members of our group.

get with someone

in. to find out about someone; to get to know someone. I’d really like to get with her, but she’s so distant.