grey matternoun [ U ]US usually gray matter uk /ˈɡreɪ ˌmæt.ər/ us /ˈɡreɪ ˌmæt̬.ɚ/
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(Definition of “grey matter” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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a group of people, especially within a political party, who try to encourage other people to follow a new, more interesting, or more active way of doing things