buy up

基本解释

These buy up patents and then license them or sue for infringement, rather than using the patents themselves.
它们购买专利不是为了自己使用，转而注册成为自己所有，或用于高发侵权行为。
Tech companies are spending billions of dollars to buy up patents — not to drive innovation, but to defend themselves from potential lawsuits.
技术公司花费数以亿计的美元来购买专利——而非驱动创新，只是在防范潜在的诉讼。
State-controlled manufacturers sell goods on the global market and buy up natural resources. Sovereign-wealth funds invest the profits from all of this activity in global markets.
国有控股的生产商们四处购买自然资源加工成工业品再转卖世界各地，主权财富基金也从全球的投资活动中获益。

The central bank said it would buy up to an additional seven hundred fifty billion dollars in mortgage-related securities.
Then you might--well let me ask you this, what would happen if Google decided to buy up all of its shares?
你也可能,我来问问你,如果谷歌决定购回它所有的股票会怎么样呢
耶鲁公开课 - 金融市场课程节选
If you want to buy the company you have to buy up all the debt and all the equity.
如果你想买下公司,你必须买下所有的负债和股票
耶鲁公开课 - 金融市场课程节选

Alibaba was also granted options to buy up to 30% of Weibo in the future.
FORBES: Alibaba Buys 18% Of "China's Twitter" Weibo For $586 Mln

If you buy up land, property, or a commodity, you buy large amounts of it, or all that is available.