British english - someone who is looking pale, not their usual colour. To mean someone who is feeling unwell, "not themselves" or their "usual self" on that day. Can also be a team or department not performing to their usual standard.
"Are you alright? You look a bit off colour"
"The team played off colour today"
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You're feeling off colour when there's something wrong with your health even though it's nothing to worry about.
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".
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When you leave food coloring out too long and it goes all modly and staly.
The gone off food colouring tastes like piss.