Simple past tense and past participle of protest.(verb)
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Use "protested" in a sentence
"The Rovers captain protested his innocence, but after consultation with an assistant, Lee Probert quite properly took the view that Samba had brought down Welbeck and had been the last defender."
""You'll be aground," the captain protested, seizing the wheel."
"Ireland, India, South Africa, and New Zealand countries with active publication in English protested the settlement and have been exempted from it."