Simple past tense and past participle of smear.(verb)
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Use "smeared" in a sentence
"Short sighted people shouldn't look far ... just go back to how John McCain smeared Mitt Romney and turned right around to advocate for a clean and honest campaign."
"Johnny Mac appealed to bigotry and prejudice - in short smeared - first Republicans, then all us 'mericuns:"
"President Bush again smeared opponents of the Iraq war last night, accusing them of “waving the white flag of surrender.”"