1.
to buy shares in a company, especially in order to gain some control over it
2.
( informal ) to believe sth, 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.
1.
to buy shares in a company, especially in order to gain some control over it
2.
( informal ) to believe sth, 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.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005