class action
US /klæs ˈæk.ʃən/
UK /klæs ˈæk.ʃən/

1.
a lawsuit in which a large group of people collectively bring a claim to court and/or in which a class of defendants is being sued.
:
•
The consumers filed a class action lawsuit against the company for defective products.
•
The court approved the class action settlement.