To have a high fever in English is commonly expressed as "to have a fever" or "to have a high temperature." The phrase "to have a fever" comes from the concept of having an elevated body temperature due to illness or infection. This can be seen in the following example sentences:

I think I have a fever. My body feels hot and I'm sweating a lot.

My little sister has a high fever. We need to take her to the doctor.

In Chinese, "发高烧" (fā gāoshāo) literally means "to have a high fever." This is a common way to describe someone who is sick with a fever in Chinese. Here are some example sentences in Chinese:

我想我发高烧了。我觉得身体很热，流汗很多。

我的小妹妹发高烧了。我们需要带她去看医生。

I hope this helps! If you have any other questions, feel free to ask.