Definition of grass roots noun from the Oxford Advanced American Dictionary

 

grass roots

 noun
noun
 
[plural]the grass roots
 
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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
grass-rootsadjective[only before noun]
 
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We need support at the grass-roots level.
See the Oxford Advanced Learner's Dictionary entry: grass roots