Definition of grass roots noun from the Oxford Advanced Learner's Dictionary

 

grass roots

 noun
noun
BrE
 
; NAmE
 
[plural](also grassroots, the grass roots) Belonging to society
 
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ordinary people in society or in an organization, rather than the leaders or people who make decisions the grass roots of the party We need support at grass-roots level. See related entries: Belonging to society
See the Oxford Advanced American Dictionary entry: grass roots