1
general::
Phrase(s): buy in(to something)
1. Lit. to purchase shares of something; to buy a part of something the ownership of which is shared with other owners. • I bought into a company that makes dog food. • Sounds like a good company. I would like to buy in. 2. Fig. to agree with; to accept an idea as worthwhile. • The committee liked my proposal and decided to buy into my plan. • Do you think you can get the whole board to buy in?
McGrawhill's American Idioms And Phrasal Verbs