If something perturbs you, it worries you quite a lot.
What perturbs me is that magazine articles are so much shorter nowadays.
Matt Haig的新书 The Midnight Library 也出现了这个表达：
cash in （on）
If you say that someone cashes in on a situation, you are criticizing them for using it to gain an advantage, often in an unfair or dishonest way.
①Residents said local gang leaders had cashed in on the violence to seize valuable land.
②He said that public servants should use government to serve and not to cash in .
《经济学人》一篇题为 Terminal value 的文章也出现了这个表达：
这里要补充一点，“cash in ”也可以表示“将(保险单等)兑现 ”【If you cash in something such as an insurance policy, you exchange it for money.】
He did not cash in his shares.
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