protester
US /ˈproʊ.tes.tɚ/
UK /ˈproʊ.tes.tɚ/

1.
متظاهر, معترض
a person who publicly demonstrates strong objection to something or expresses dissent, often as part of a group
:
•
The police arrested several protesters at the demonstration.
اعتقلت الشرطة العديد من المتظاهرين في المظاهرة.
•
She joined the group of environmental protesters.
انضمت إلى مجموعة المتظاهرين البيئيين.