“买下”的英语可以翻译为：[经] buy out ...

他以10万美元买下一处投资性地产，并支付了2万美元的定金。He bought an investment property for $100,000 and put down $20,000.我几乎是以一英镑一件的价钱买下了它们。I bought them for a pound apiece, near enough.你可以买下它，不过你要花一大笔钱。You can have it, but it'll cost you a...