Idiom of the day - Feeling under the weather

FEELING UNDER THE WEATHER - feeling ill, or unable to perform regular activities efficiently

Eg.: "Why were you not attentive at the meeting today?" "I don't know, I might be feeling a bit under the weather." 

Eg.: I'm feeling quite under the weather today. I don't think I can go to work."

Eg.: "Let's go fishing today!" "I don't think I can join you guys. I'm feeling a little under the weather."

Eg.: Ross has been feeling under the weather for a few days now, so he's gonna go see a doctor today.