Under the weather, phrase.
Definition (informal): Slightly unwell or in low spirits.
Examples:
1. She was sufficiently under the weather to have to pull out of the championship.
2. He's been under the weather since he's been on his own.
3. I feel sick, have a painful headache and feel a bit under the weather, but I know that if I push myself and get out of bed I will feel better.
4. And every time I go for a stroll by the river when I'm feeling a bit under the weather, I come back home wondering why I felt so poorly in the first place.
5. So I'm more than a bit under the weather at present.
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@cambridge_dic
