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buy into (something)
1. To make a financial investment in a business or similar venture. I refuse to buy into my brother's latest scheme because I highly doubt it will ever make a penny—let alone millions.
2. To believe in and support an idea, concept, or system. Rod's a good enough coach, but he just can't get the players to buy into his system. We can't approach the CEO with our idea for overhauling the computer system until we get our boss to buy into it first.
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]
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.