attroupement

From attrouper (“to gather”) +‎ -ment.

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attroupement m (plural attroupements)

1. gathering (of people), mob (large or disorderly group of people, especially one bent on riotous or destructive action)
2. gathering, mobbing (action of crowding into or around a place in a disorganized and possibly riotous manner)

• “attroupement”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.