feel off
People may say it when they are not doing as well as they would usually do. Not feeling well somehow.Feeling off colour
You're feeling off colour when there's something wrong with your health even though it's nothing to worry about.
Example:
John:"I'm feeling off colour today, it's nothing serious but something's not quite right"
John's mum:"Well, you shouldn't go to school then. I'll call the doctor".
John:"I'm feeling off colour today, it's nothing serious but something's not quite right"
John's mum:"Well, you shouldn't go to school then. I'll call the doctor".