Combination of rack (v), a medieval torture method, and brain, thus meaning to cause the mind extreme discomfort.
"rack-one-s-brain." YourDictionary, n.d. Web. 16 December 2018. <https://www.yourdictionary.com/rack-one-s-brain>.
rack-one-s-brain. (n.d.). Retrieved December 16th, 2018, from https://www.yourdictionary.com/rack-one-s-brain
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