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grey matter
grey matter [noun]
A person's intelligence
US
/ˈɡreɪ ˌmæt̬.ɚ/
UK
/ˈɡreɪ ˌmæt.ər/
مادهى خاكسترى مغز و نخاع شوكى
مثال:
It's not the sort of movie that stimulates the old grey matter much