grass roots
plural noun
(alsograssroots)us/ˈɡræs ˈruts,ˈrʊts/theordinarypeoplein asociety,movement, ororganization:
Shespentyearstryingtodesigneducationpolicyfrom the grass roots up.
grass-roots
adjective[not gradable](alsograssroots)us/ˌɡræsˌruts,ˈrʊts/
a grass-rootsmovement