grass roots
US /ˈɡræs ruːts/
UK /ˈɡræs ruːts/

1.
base, racines
the most basic level of an activity or organization
:
•
The movement gained support at the grass roots level.
Le mouvement a gagné du soutien au niveau des bases.
•
We need to build support from the grass roots up.
Nous devons construire un soutien à partir de la base.
1.
de base, participatif
of or relating to the ordinary people in an organization or political party, rather than its leaders or most important members
:
•
The campaign focused on grass roots organizing.
La campagne s'est concentrée sur l'organisation de base.
•
He believes in grass roots democracy.
Il croit en la démocratie participative.