buy into, to

buy into

Purchase a membership, a share, or an interest in something. For example, I'd love to buy into this partnership, but I can't afford it. [First half of 1600s]
See also: buy

buy into

v.
1. To acquire a stake or interest in something, especially a business or organization: I bought into a risky real estate venture, and fortunately I didn't lose any money.
2. To believe in something, especially wholeheartedly or uncritically: I can't buy into your brand of politics.
See also: buy

buy into, to

To believe in, to take for real. This phrase transfers the purchasing of a membership or stake in something to an uncritical acceptance. The British newspaper Telegraph headlined an article by Jenny McCartney that criticized the former British prime minister’s awards and other accolades, “Why Does the World Buy into Tony Blair?” (July 3, 2010).
See also: buy