buy into

US /baɪ ˈɪntuː/
UK /baɪ ˈɪntuː/
"buy into" picture
1.

賛同する, 信じる

to believe in an idea or accept a proposal, especially one that is not universally accepted

:
I don't buy into the idea that money can solve all problems.
お金がすべての問題を解決できるという考えには賛同しません
Many people buy into the dream of owning a big house.
多くの人が大きな家を持つという夢に賛同しています
2.

出資する, 株を買う

to purchase a share or interest in a business or venture

:
He decided to buy into the new startup.
彼は新しいスタートアップに出資することを決めた。
Are you planning to buy into the family business?
家業に出資する予定ですか?