To be under the weather is to be unwell.

感到不适就是身体不舒服。

For example, they often say they are " under the weather" when they are ill.

当他们身体不舒服时，他们常说自己是“根据天气”。

I wouldn't feel anything other than at most a little cold or be under the weather.

我最多也就是有点冷或者身体不舒服，什么都感觉不到。

" To be under the weather" means to be slightly ill, not fully ill just slightly ill.

“略微不适”意思是有点不舒服，不是完全不舒服，只是有点不舒服。

When you say you are under the weather, it means you are sick or not feeling well.

当你说自己“under the weather（身体不舒服）”时，意思是你生病了不舒服。

Last week, I was under the weather.

上周，我身体不舒服。

Sorry to hear that Granddad's been under the weather.

很抱歉听说爷爷身体不舒服。

All right. " I'm under the weather" or " I'm a little under the weather" . So, " under the weather" is an idiom which means you are sick. You are not feeling well.

好吧。 “我在天气下” 或“我有点不适应天气” 。所以，“天气下” 是一个成语， 意思是你生病了。 你感觉不舒服。

" I'm sorry to hear you're under the weather, " said Hermione, talking firmly over the little wizard and he tried to expound upon his problems; it was essential to stop him from reaching the street. " Here, have a sweet."

“听到你的回答我感到很遗憾，”当小个巫师解释他的问题时，赫敏镇静的回答。必须在他们走到街上前阻止他。“来，吃块糖。”