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8 Words That Are Older Than You Think

brainfag

[breyn-fag] /ˈbreɪnˌfæg/
noun, Informal.
1.
prolonged mental fatigue.
Origin
1850-1855
1850-55; brain + fag1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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