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protester

 
 
/prəˈtestər/ noun [C]

Definition

someone who protests publicly about something, especially as part of a group: Up to 100,000 protesters are expected to march. anti-war/civil rights protesters
someone who complains strongly about something: fuel/tax protesters The party leadership has backed fuel protesters and their calls for lower petrol taxes.
(Definition of protester noun from the Cambridge Business English Dictionary © Cambridge University Press)

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