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Being "in one's box" means to be sad, reserved, and in need of comfort just as a cat retreats into the smallest box possible to feel safe. One could be "in their box" if they are not interested in social interaction for any number of reasons.
Spencer said "I'm in my box" at dinner because he failed an exam but had already arranged to get food with a friend.
by dfskldkflhsdkf December 12, 2017
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