People who publicly express disagreement or objection to something, usually through demonstrations, marches, or organized opposition.
From Latin 'protestari,' meaning to declare publicly against. 'Protest' came to English through Old French, and 'protestor' is the agent noun (one who protests).
Protestors literally 'testify against'—the 'pro' means in front and 'testify' is the root, so a protestor is someone who publicly speaks against something, which is exactly what protests are about.
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