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Out to lunch

Posted by Fariba Asghari on April 24, 2001

I want to know what "out to lunch" means.when it is used. I've heard it of my teacher and he told me: "you are out to lunch" whenever I wasn't mentaly there and I was thinking about something else.Did he use it in right way.Which expression is used to say that somebody is physically with you but he is not mentally with you.