hook up with
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hook up with someone
1. Fig. Inf. to meet with someone. Fancy hooking up with you here, Bill. How have you been? Well, hello, Tom. I didn't think I'd hook up with you again so soon.
2. Fig. to join forces with someone. If we hook up with each other it'll be easier to defeat the others. These two competitors have hooked up together and we now have a real problem.