答案在The Economist January 15th 2022 Britain 中“Bagehot 丨What did you expect? The prime minister, in his own way, is Britain’s most honest politician”这篇文章第三段可以找到。

The Economist January 15th 2022 Britain

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drum up 鼓励，激起，鼓动

同义词：encourage; stimulate; inspire; spark

试译下这段吧

When he(Boris Johnson) was drumming up support for his bid for party leader, his pitch was simple: back me, keep your seat, defeat Jeremy Corbyn and do Brexit. And it all came true. Mr Corbyn was crushed and the biggest Conservative majority in three decades followed. In that election Mr Johnson promised two big things and did both. The NHS would be showered with cash, which it has been. And he would do a deal with the EU, which he did.

他（鲍里斯·约翰逊）正为自己竞选政党领袖竭力争取支持，而他的主张（推销）很简单：支持我，保住你的席位，击败杰里米·科尔宾(Jeremy Corbyn)，拿下英国脱欧。这一切都实现了。科尔宾被击败，随后是三十年来最大的保守党多数派被击败。在那次选举中，约翰逊承诺了两件大事，并且都做到了。英国国民保健系统将会得到大量的现金，事实也的确如此。他将与欧盟达成协议，他做到了。

此外，The Economist October 17th 2020 Leaders 中 “Tech investing and the Vision Fund”这篇文章也出现过“drum up”。

The Economist October 17th 2020 Leaders

"If I’m going to do a fund it has to be big enough to disrupt the whole technology world." So declared Son Masayoshi four years ago, on a trip to the Middle East to drum up cash for a new investment vehicle to take on Silicon Valley’s venture capitalists (VCS). His Vision Fund eventually raised $98.6bn and bought stakes in some of the world’s most exciting companies, including ByteDance and Uber. Yet as we explain this week, Mr Son’s mission has so far had mixed results (see Business section). Performance has been soggy, despite a boom in tech stocks, as the strategy of pouring money into private firms has at times become rather like spoiling perpetual adolescents. Instead, the Vision Fund’s most striking legacy may be that it has marked the start of a new era in which American capital and startups no longer call all the shots.

“如果我要设立一只基金，它必须大到足以颠覆整个科技界。”四年前，孙正义这样宣称，当时他正在中东旅行，为一个新的投资工具筹集现金，以便与硅谷的风险投资家(VCS)抗衡。他的愿景基金最终筹集了986亿美元资金，并购买了包括字节跳动和优步等全球一些最具活力公司的股份。然而，正如我们本周所解释的那样，孙正义的愿景迄今取得了喜忧参半的结果（见"Business"部分）。尽管科技股蓬勃发展，但表现一直持续低迷，这是因为向私人公司注入资金的策略有时变得更像是对一个永远长不大的孩子的溺爱。相反，愿景基金最引人注目的贡献可能是，它标志着一个新时代的开始，在这个新时代，美国资本和初创企业不能再发号施令（一手遮天，操纵一切）。

任何译文没有标准答案，此译文未经推敲深究，仅供参考，欢迎评论、点赞、收藏、转发！