From Longman Dictionary of Contemporary Englishgo in with somebody phrasal verbto join with someone else to start a business or organization Ellie’s going in with a friend who’s just started a café. → go→ See Verb table
Examples from the Corpus
go in with • Auctiongoers, whether novices or experienced bidders, need to go in with a budget in mind.• I've got a chance to go in with a women's group up Manchester way.• Jud, John and I tend not to go in with all of these preconceived notions.• Tommy doesn't drink, but he would go in with his pals.• If I'd known then what I knew later, the envelope would have gone in with it.• He went in with no expectations and walked away without a whole lot of disappointment.• Ellis pulled the Honda in behind it and went in with Petal.• Her husband, Rainer, he wasn't hit but he went in with them. 