social movement
US /ˈsoʊʃl ˈmuːvmənt/
UK /ˈsoʊʃl ˈmuːvmənt/

1.
movimento social
a loosely organized effort by a large group of people to achieve a particular goal, typically a social or political one
:
•
The civil rights social movement transformed American society.
O movimento social pelos direitos civis transformou a sociedade americana.
•
Environmental protection is a growing social movement worldwide.
A proteção ambiental é um movimento social crescente em todo o mundo.