a person who publicly expresses strong disagreement with something, often by marching, demonstrating, or speaking out against it.
From the verb 'protest,' which comes from Latin 'protestari' meaning 'to declare publicly.' The suffix '-er' indicates a person who does the action, making it a common way to create agent nouns in English.
Protesters have shaped history—from civil rights marches to environmental movements—by refusing to stay silent, and the word itself literally means someone making a public declaration of disagreement.
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