Focus on the pronunciation of buy into sth
English definition of “buy into sth”
buy into sth — Phrasal Verb with buy
/baɪ/ verb (bought, bought)
› FINANCE to buy a part of a business in order to have some control over it: McDowell was trying to buy into the newspaper business.
› to support or believe in an idea or plan: To create an effective brand, you need to convince people to buy into it.