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Definition of brain fog noun from the Oxford Advanced Learner's Dictionary

brain fog

noun
 
/ˈbreɪn fɒɡ/
 
/ˈbreɪn fɔːɡ/
[uncountable] (informal)
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  1. a temporary lack of ability to concentrate or think clearly
    • He's still experiencing fatigue and brain fog.
    Word OriginMid 19th century; earliest use found in German Reformed Messenger.
trait
noun
 
 
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