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.

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。

youdao

Typically, trafficking not only destroys its victims' bodies with AIDS but maims their spirits as well, leaving them feeling so worthless that they can't easily return to normal life.

典型的情况是，这类非法交易不只用艾滋病毒损毁受害者们的身体，还弄垮她们的精神，让她们感觉自己如此没有价值，以致她们很难恢复正常的生活。

youdao

I was not feeling very well so the doctor checked my heart and said I needed more exercise.

我感觉不是很舒服，因此医生检查了我的心脏并说我需要多锻炼。

youdao

Let's say that you're not feeling so well.

假设你觉得有点不舒服。

Don't 课堂 - SpeakingMax英语口语达人

It feels almost exactly how I remember the original X-Com feeling, even though I have a feeling that game might not hold up so well all these years later.

FORBES: A Brief Look At High-Stakes Strategy Shooter 'XCOM: Enemy Unknown'

Seven-months-pregnant Raizy Glauber had not been feeling well, the family said, so the couple called a cab to take them to hospital.

BBC: Baby dies day after his parents killed in NY car crash

Raizy Glauber was seven months' pregnant and had not been feeling well, the family said, so the couple called a taxi to take them to hospital.

BBC: Julio Acevedo arrested over New York hit-and-run deaths