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

1.
movimento sociale
a loosely organized effort by a large group of people to achieve a particular goal, typically a social or political one
:
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The civil rights social movement transformed American society.
Il movimento sociale per i diritti civili ha trasformato la società americana.
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Environmental protection is a growing social movement worldwide.
La protezione ambientale è un movimento sociale in crescita in tutto il mondo.