pro ‧ test ‧ er /prəˈtestə $ -ər/ BrE AmE noun [countable]
someone who takes part in a public activity such as a ↑ demonstration in order to show their opposition to something
pro ‧ test ‧ er /prəˈtestə $ -ər/ BrE AmE noun [countable]
someone who takes part in a public activity such as a ↑ demonstration in order to show their opposition to something
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012