Definition of buy into phrasal verb from the Oxford Advanced American Dictionary

 

buy into

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    buy into something

     
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  1. 1to buy shares in a company, especially in order to gain some control over it
  2. 2(informal) to believe something, especially an idea that many other people believe in She had never bought into the idea that to be attractive you have to be thin. related noun buy-in
See the Oxford Advanced Learner's Dictionary entry: buy into