我其实没有生病，但感觉很不舒服。

I wasn't actually sick but I felt lousy.

《柯林斯英汉双解大词典》

例如，“under the weather” 这个习语的意思是“生病了”。所以当人们说 “I'm under the weather” 时，他们是在说他们感觉不舒服。

For example, under the weather is an idiom meaning ill. So when people say "I'm under the weather", they are saying that they're not feeling well.

youdao

比如药，如果人们买到伪劣的，一旦服用，就会感到不舒服，生病，最严重的情形就是因此失去生命。

Such as the medicine, if people buy the fake one, once they eat it, they will feel uncomfortable and get the illness, the most terrible situation is that they will kill themselves.

youdao