buy into

"I said to him 'your son has to be your friend as well, Chris'. I don't think he ever bought into that."

“It’s hard to get a read on what people are buying into because, honestly, they’re just buying everything,” she said, laughing.

Han knows he must exaggerate Min’s daffy naivete to get us to buy into his zeal to live in a small shack with noncommittal Chris.

“The reason of that is, I know that everybody in the locker room believes that and has also bought into whatever your role is to help us do that.”

Part of the problem with making the whole system buy into it is money.