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to show that you disagree with something by standing somewhere, shouting, carrying signs, etcA big crowd of demonstrators were protesting against cuts in health spending.
US Outside, a group of students were protesting research cuts.
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to say something forcefully or complain about somethingA lot of people protested about the new working hours.
They protested bitterly to their employers, but to no avail.
[+ that] A young girl was crying, protesting that she didn't want to leave her mother.
All through the trial he protested his innocence (= strongly said he was not guilty).