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Definition of grey matter noun from the Oxford Advanced Learner's Dictionary

grey matter

noun
 
/ˈɡreɪ mætə(r)/
 
/ˈɡreɪ mætər/
(US English usually gray matter)
[uncountable] (informal)
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  1. a person’s intelligence
    • This should exercise the old grey matter.
influence
verb
 
 
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