这一段文的上一段已经解释了 lumpy 的意思。是说生意业务的收入靠一小撮大客户，不够分散. Instead of getting your revenue spread out, you get lumps of it.

But it remains heavily reliant for its cloud revenues on a relatively small number of large customers, and any efforts by those companies to develop in-house alternatives would be a major threat.

"The cloud is entirely dependent on the deployments of large hyperscale cloud providers," said Rami Rahim, Juniper's CEO, during a call last month about third-quarter results. "Cloud has always been a highly lumpy type of vertical business because of the concentrated nature of the customer base and capex expenditures within that customer base."

https://www.lightreading.com/opticalip/routing/aws-in-house-...



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Note added at 1 day 9 hrs (2020-12-11 18:00:51 GMT)
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因为作者写 "highly lumpy", 所以也可以加 “高度” 在前面，变成：
“高度依赖一小撮大客户的垂直型业务”。

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Note added at 3 days 21 hrs (2020-12-14 06:12:58 GMT)
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Lumpy: Nope, the CEO isn’t talking about poorly cooked oatmeal whenever he or she says revenues or orders were lumpy. This term means that sales were uneven during the quarter, with some weeks having low order rates and others having high order rates. The key is finding out why sales were lumpy and whether lumpy sales are normal for the company.
https://www.dummies.com/personal-finance/investing/stocks-tr...